diff --git a/developer_docs/custom_p5_build.md b/developer_docs/custom_p5_build.md
index 9e7fcbf5ba..936d0a3e1d 100644
--- a/developer_docs/custom_p5_build.md
+++ b/developer_docs/custom_p5_build.md
@@ -14,13 +14,14 @@ Currently, the usage is through invoking a Grunt task manually from the command
 git clone https://github.com/processing/p5.js.git
 cd p5.js
 npm install
-grunt combineModules:module_x:module_y
+npm run grunt
+npm run grunt combineModules:module_x:module_y
 ```
 
-Here, `module_n` refers to the name of the module which you want to select. Multiple modules must be passed as shown above. Also, these modules must have the same name is their folders in `/src` directory to work correctly.
+Here, `module_n` refers to the name of the module which you want to select. Multiple modules must be passed as shown above. Also, these modules must have the same name is their folders in `/src` directory to work correctly. While `core` is included by default, `core/shape` needs to be included for shapes like line() and other core features to work.
 
 ## Example
 
-`grunt combineModules:color:util:events:io`
+`npm run grunt combineModules:core/shape:color:math:image`
 
-This will generate your bundle in the `lib/modules` directory.
\ No newline at end of file
+This will generate your `p5Custom.js` bundle in the `lib/modules` directory.