diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,2 +1,78 @@
-# Aegisub-DiscordRPC
-Outputs Aegisub editing to Discord Rich Presence
+# Aegisub DiscordRPC
+A Lua plugin (macro) for Aegisub to output currently editing
+subtitle information to Discord Rich Presence
+
+## Installation
+- Place the binary file `discord-rpc.dll` in your Aegisub installation folder.
+  - If you use the discouraged 64-bit Aegisub then please take the
+    provided `discord-rpc-64.dll` and rename it as `discord-rpc.dll` 
+    before placing it in your Aegisub installation folder.
+    (I don't guarantee if it would work in 64-bit Aegisub because I
+    don't use them and I can't test it. Plus, the official website
+    also discouraged the use of 64-bit release due to lack of support
+    for most of its video tools and renderer)
+- Place the script `discord-rpc.lua` into the `automation\autoload` folder.
+
+### Example
+If you installed Aegisub in `C:\Program Files (x86)\Aegisub` then:
+- Place `discord-rpc.dll` in `C:\Program Files (x86)\Aegisub`.
+- Place `discord-rpc.lua` in `C:\Program Files (x86)\Aegisub\automation\autoload`.
+
+## Usage
+When installed correctly, it will first start the rich presense
+with `Idle` as the detail and `No video file loaded yet` as the state
+whenever you launched Aegisub.
+
+![First launch](./img/first-launch.png "First launch")
+
+Then, load your subtitle and video, and click on `Update Discord RPC`
+from the `Automation` menu to let Aegisub update the Rich Presence
+as `Editing subtitle` as the detail and the video file name as
+the state.
+
+![Click on the menu](./img/click-menu.png "Click on the menu")
+![Details are updated](./img/detail-updated.png "Details are updated")
+
+### Warning
+Please make sure that you have done either any of below before
+clicking `Update Discord RPC` menu:
+- You have already loaded the video for the subtitle you're editing.
+- You have already loaded subtitle file containing video path.
+
+This is because of limitation in Aegisub, it doesn't expose the
+subtitle file name nor the window title to its Lua environment.
+It does, however, expose the subtitle property metadata to the
+Lua environment, and video path is one of the metadata in it.
+
+I'm accessing that video path from the subtitle metadata for
+display in Rich Presence, and it would not work if you did not
+load any video for the subtitle file ever as the video path will
+not be there in the subtitle metadata.
+
+I initially planned to automatically load the video path when
+Aegisub is launched, but it seems that the Lua script is loaded
+*before* the subtitle metadata itself, which is why I had to
+implement the "click on menu to update Discord RPC" method.
+
+## References
+### Script
+This script uses some code from pfirsich's `lua-discordRPC`.
+Visit [their repository](https://github.com/pfirsich/lua-discordRPC "pfirsich/lua-discordRPC on GitHub")
+to learn more, especially if you want to use Discord Rich Presence in Lua.
+
+Their script is licensed under MIT.
+
+### Binary
+The binaries included in this repository came from Discord RPC
+official releases. You can also download the binaries directly from
+their [official repository](https://github.com/discordapp/discord-rpc/releases/latest "Latest Discord RPC release").
+
+Make sure to take the dynamic version of binary:
+- Take `discord-rpc/win32-dynamic/bin/discord-rpc.dll` for 32-bit Aegisub
+- Take `discord-rpc/win64-dynamic/bin/discord-rpc.dll` for 64-bit Aegisub
+
+Their binaries and source code are licensed under MIT.
+
+## License
+This script and the included binaries are released under
+[The MIT License](./LICENSE "Read full license text").
diff --git a/discord-rpc-64.dll b/discord-rpc-64.dll
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diff --git a/discord-rpc.dll b/discord-rpc.dll
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diff --git a/discord-rpc.lua b/discord-rpc.lua
new file mode 100644
index 0000000..7671b98
--- /dev/null
+++ b/discord-rpc.lua
@@ -0,0 +1,296 @@
+-- Discord RPC
+-- Outputs current editing session to Discord Rich Presence
+--
+-- This file is written by muhdnurhidayat
+-- Latest release and details at https://github.com/MuhdNurHidayat/Aegisub-DiscordRPC
+-- This file is licensed under MIT
+--
+-- This file uses some code from https://github.com/pfirsich/lua-discordRPC
+-- The codes from pfirsich/lua-discordRPC is licensed under MIT
+--
+
+local ffi = require "ffi"
+local discordRPClib = ffi.load("discord-rpc")
+local appId = "592657785368477728"
+
+script_name = "Discord RPC"
+script_description = "Outputs Aegisub editing to Discord Rich Presence"
+script_author = "muhdnurhidayat"
+script_version = "1"
+
+ffi.cdef[[
+typedef struct DiscordRichPresence {
+	const char* state;   /* max 128 bytes */
+	const char* details; /* max 128 bytes */
+	int64_t startTimestamp;
+	int64_t endTimestamp;
+	const char* largeImageKey;  /* max 32 bytes */
+	const char* largeImageText; /* max 128 bytes */
+	const char* smallImageKey;  /* max 32 bytes */
+	const char* smallImageText; /* max 128 bytes */
+	const char* partyId;        /* max 128 bytes */
+	int partySize;
+	int partyMax;
+	const char* matchSecret;    /* max 128 bytes */
+	const char* joinSecret;     /* max 128 bytes */
+	const char* spectateSecret; /* max 128 bytes */
+	int8_t instance;
+} DiscordRichPresence;
+
+typedef struct DiscordUser {
+	const char* userId;
+	const char* username;
+	const char* discriminator;
+	const char* avatar;
+} DiscordUser;
+
+typedef void (*readyPtr)(const DiscordUser* request);
+typedef void (*disconnectedPtr)(int errorCode, const char* message);
+typedef void (*erroredPtr)(int errorCode, const char* message);
+typedef void (*joinGamePtr)(const char* joinSecret);
+typedef void (*spectateGamePtr)(const char* spectateSecret);
+typedef void (*joinRequestPtr)(const DiscordUser* request);
+
+typedef struct DiscordEventHandlers {
+	readyPtr ready;
+	disconnectedPtr disconnected;
+	erroredPtr errored;
+	joinGamePtr joinGame;
+	spectateGamePtr spectateGame;
+	joinRequestPtr joinRequest;
+} DiscordEventHandlers;
+
+void Discord_Initialize(const char* applicationId,
+						DiscordEventHandlers* handlers,
+						int autoRegister,
+						const char* optionalSteamId);
+
+void Discord_Shutdown(void);
+
+void Discord_RunCallbacks(void);
+
+void Discord_UpdatePresence(const DiscordRichPresence* presence);
+
+void Discord_ClearPresence(void);
+
+void Discord_Respond(const char* userid, int reply);
+
+void Discord_UpdateHandlers(DiscordEventHandlers* handlers);
+]]
+
+local discordRPC = {} -- module table
+
+-- proxy to detect garbage collection of the module
+discordRPC.gcDummy = newproxy(true)
+
+local function unpackDiscordUser(request)
+	return ffi.string(request.userId), ffi.string(request.username),
+		ffi.string(request.discriminator), ffi.string(request.avatar)
+end
+
+-- callback proxies
+-- note: callbacks are not JIT compiled (= SLOW), try to avoid doing performance critical tasks in them
+-- luajit.org/ext_ffi_semantics.html
+local ready_proxy = ffi.cast("readyPtr", function(request)
+	if discordRPC.ready then
+		discordRPC.ready(unpackDiscordUser(request))
+	end
+end)
+
+local disconnected_proxy = ffi.cast("disconnectedPtr", function(errorCode, message)
+	if discordRPC.disconnected then
+		discordRPC.disconnected(errorCode, ffi.string(message))
+	end
+end)
+
+local errored_proxy = ffi.cast("erroredPtr", function(errorCode, message)
+	if discordRPC.errored then
+		discordRPC.errored(errorCode, ffi.string(message))
+	end
+end)
+
+-- helpers
+function checkArg(arg, argType, argName, func, maybeNil)
+	assert(type(arg) == argType or (maybeNil and arg == nil),
+		string.format("Argument \"%s\" to function \"%s\" has to be of type \"%s\"",
+			argName, func, argType))
+end
+
+function checkStrArg(arg, maxLen, argName, func, maybeNil)
+	if maxLen then
+		assert(type(arg) == "string" and arg:len() <= maxLen or (maybeNil and arg == nil),
+			string.format("Argument \"%s\" of function \"%s\" has to be of type string with maximum length %d",
+				argName, func, maxLen))
+	else
+		checkArg(arg, "string", argName, func, true)
+	end
+end
+
+function checkIntArg(arg, maxBits, argName, func, maybeNil)
+	maxBits = math.min(maxBits or 32, 52) -- lua number (double) can only store integers < 2^53
+	local maxVal = 2^(maxBits-1) -- assuming signed integers, which, for now, are the only ones in use
+	assert(type(arg) == "number" and math.floor(arg) == arg
+		and arg < maxVal and arg >= -maxVal
+		or (maybeNil and arg == nil),
+		string.format("Argument \"%s\" of function \"%s\" has to be a whole number <= %d",
+			argName, func, maxVal))
+end
+
+-- function wrappers
+function discordRPC.initialize(applicationId, autoRegister, optionalSteamId)
+	local func = "discordRPC.Initialize"
+	checkStrArg(applicationId, nil, "applicationId", func)
+	checkArg(autoRegister, "boolean", "autoRegister", func)
+	if optionalSteamId ~= nil then
+		checkStrArg(optionalSteamId, nil, "optionalSteamId", func)
+	end
+
+	local eventHandlers = ffi.new("struct DiscordEventHandlers")
+	eventHandlers.ready = ready_proxy
+	eventHandlers.disconnected = disconnected_proxy
+	eventHandlers.errored = errored_proxy
+	eventHandlers.joinGame = joinGame_proxy
+	eventHandlers.spectateGame = spectateGame_proxy
+	eventHandlers.joinRequest = joinRequest_proxy
+
+	discordRPClib.Discord_Initialize(applicationId, eventHandlers,
+		autoRegister and 1 or 0, optionalSteamId)
+end
+
+function discordRPC.shutdown()
+	discordRPClib.Discord_Shutdown()
+end
+
+function discordRPC.runCallbacks()
+	-- http://luajit.org/ext_ffi_semantics.html#callback :
+	-- One thing that's not allowed, is to let an FFI call into a C function (runCallbacks)
+	-- get JIT-compiled, which in turn calls a callback, calling into Lua again (i.e. discordRPC.ready).
+	-- Usually this attempt is caught by the interpreter first and the C function
+	-- is blacklisted for compilation.
+	-- solution:
+	-- Then you'll need to manually turn off JIT-compilation with jit.off() for
+	-- the surrounding Lua function that invokes such a message polling function.
+	jit.off()
+	discordRPClib.Discord_RunCallbacks()
+	jit.on()
+end
+
+function discordRPC.updatePresence(presence)
+	local func = "discordRPC.updatePresence"
+	checkArg(presence, "table", "presence", func)
+
+	-- -1 for string length because of 0-termination
+	checkStrArg(presence.state, 127, "presence.state", func, true)
+	checkStrArg(presence.details, 127, "presence.details", func, true)
+
+	checkIntArg(presence.startTimestamp, 64, "presence.startTimestamp", func, true)
+	checkIntArg(presence.endTimestamp, 64, "presence.endTimestamp", func, true)
+
+	checkStrArg(presence.largeImageKey, 31, "presence.largeImageKey", func, true)
+	checkStrArg(presence.largeImageText, 127, "presence.largeImageText", func, true)
+	checkStrArg(presence.smallImageKey, 31, "presence.smallImageKey", func, true)
+	checkStrArg(presence.smallImageText, 127, "presence.smallImageText", func, true)
+	checkStrArg(presence.partyId, 127, "presence.partyId", func, true)
+
+	checkIntArg(presence.partySize, 32, "presence.partySize", func, true)
+	checkIntArg(presence.partyMax, 32, "presence.partyMax", func, true)
+
+	checkStrArg(presence.matchSecret, 127, "presence.matchSecret", func, true)
+	checkStrArg(presence.joinSecret, 127, "presence.joinSecret", func, true)
+	checkStrArg(presence.spectateSecret, 127, "presence.spectateSecret", func, true)
+
+	checkIntArg(presence.instance, 8, "presence.instance", func, true)
+
+	local cpresence = ffi.new("struct DiscordRichPresence")
+	cpresence.state = presence.state
+	cpresence.details = presence.details
+	cpresence.startTimestamp = presence.startTimestamp or 0
+	cpresence.endTimestamp = presence.endTimestamp or 0
+	cpresence.largeImageKey = presence.largeImageKey
+	cpresence.largeImageText = presence.largeImageText
+	cpresence.smallImageKey = presence.smallImageKey
+	cpresence.smallImageText = presence.smallImageText
+	cpresence.partyId = presence.partyId
+	cpresence.partySize = presence.partySize or 0
+	cpresence.partyMax = presence.partyMax or 0
+	cpresence.matchSecret = presence.matchSecret
+	cpresence.joinSecret = presence.joinSecret
+	cpresence.spectateSecret = presence.spectateSecret
+	cpresence.instance = presence.instance or 0
+
+	discordRPClib.Discord_UpdatePresence(cpresence)
+end
+
+function discordRPC.clearPresence()
+	discordRPClib.Discord_ClearPresence()
+end
+
+local replyMap = {
+	no = 0,
+	yes = 1,
+	ignore = 2
+}
+
+-- maybe let reply take ints too (0, 1, 2) and add constants to the module
+function discordRPC.respond(userId, reply)
+	checkStrArg(userId, nil, "userId", "discordRPC.respond")
+	assert(replyMap[reply], "Argument 'reply' to discordRPC.respond has to be one of \"yes\", \"no\" or \"ignore\"")
+	discordRPClib.Discord_Respond(userId, replyMap[reply])
+end
+
+-- garbage collection callback
+getmetatable(discordRPC.gcDummy).__gc = function()
+	discordRPC.shutdown()
+	ready_proxy:free()
+	disconnected_proxy:free()
+	errored_proxy:free()
+end
+
+function discordRPC.ready(userId, username, discriminator, avatar)
+    print("[discordrpc] Discord: ready (" .. userId .. ", " .. username .. ", " .. discriminator ", " .. avatar .. ")")
+end
+
+function discordRPC.disconnected(errorCode, message)
+    print("[discordrpc] Discord: disconnected (" .. errorCode .. ": " .. message .. ")")
+end
+
+function discordRPC.errored(errorCode, message)
+    print("[discordrpc] Discord: error (" .. errorCode .. ": " .. message .. ")")
+end
+
+discordRPC.initialize(appId, true)
+local now = os.time(os.date('*t'))
+presence = {
+    state = "No video file loaded yet",
+    details = "Idle",
+    startTimestamp = now,
+    largeImageKey = "aegisub",
+    smallImageKey = "",
+}
+discordRPC.updatePresence(presence)
+
+function update_rpc()
+    if (aegisub.project_properties() ~= nil) then
+        local videoname = aegisub.project_properties().video_file;
+        if (videoname ~= " ") then
+            videoname = videoname:match("[^\\]*$")
+            if(string.len(videoname) > 117) then
+                videoname = string.sub(videoname, 1, 117) .. "…"
+            end                
+            presence = {
+                state = "Video: " .. videoname,
+                details = "Editing subtitle",
+                startTimestamp = now,
+                largeImageKey = "aegisub",
+                smallImageKey = "",
+            }
+            discordRPC.updatePresence(presence)
+        else
+            aegisub.debug.out("Please ensure your subtitle file has video file path defined before updating the RPC")
+        end
+    else
+        aegisub.debug.out("Please ensure your subtitle file has video file path defined before updating the RPC")
+    end
+end
+
+aegisub.register_macro("Update Discord RPC", "Update Discord Rich Presence", update_rpc)
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