diff --git a/README.md b/README.md
index 252e8a7..f928542 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ Here `BNGNetwork` is a type specifying the file format that is being loaded.
 `prnbng` is a `ParsedReactionNetwork` structure with the following fields:
 
   - `rn`, a Catalyst `ReactionSystem`
-  - `u₀`, a `Dict` mapping initial condition symbolic variables to numeric values
+  - `u0`, a `Dict` mapping initial condition symbolic variables to numeric values
     and/or symbolic expressions.
   - `p`, a `Dict` mapping parameter symbolic variables to numeric values and/or
     symbolic expressions.
@@ -221,4 +221,4 @@ initialconditionf = "PATH/TO/FILE"
 networkf = "PATH/TO/FILE"
 rssarn = loadrxnetwork(RSSANetwork(), "RSSARxSys", initialconditionf, networkf)
 ```
-Here `RSSANetwork` specifies the type of the file to parse, and `RSSARxSys` gives the type of the generated `reaction_network`. `rssarn` is again a `ParsedReactionNetwork`, but only the `rn` and `u₀` fields will now be relevant (the remaining fields will be set to `nothing`). -->
+Here `RSSANetwork` specifies the type of the file to parse, and `RSSARxSys` gives the type of the generated `reaction_network`. `rssarn` is again a `ParsedReactionNetwork`, but only the `rn` and `u0` fields will now be relevant (the remaining fields will be set to `nothing`). -->
diff --git a/docs/src/index.md b/docs/src/index.md
index 2452885..af3106c 100644
--- a/docs/src/index.md
+++ b/docs/src/index.md
@@ -64,7 +64,7 @@ Here `BNGNetwork` is a type specifying the file format that is being loaded.
 `prnbng` is a `ParsedReactionNetwork` structure with the following fields:
 
   - `rn`, a Catalyst `ReactionSystem`
-  - `u₀`, a `Dict` mapping initial condition symbolic variables to numeric values
+  - `u0`, a `Dict` mapping initial condition symbolic variables to numeric values
     and/or symbolic expressions.
   - `p`, a `Dict` mapping parameter symbolic variables to numeric values and/or
     symbolic expressions.
diff --git a/src/ReactionNetworkImporters.jl b/src/ReactionNetworkImporters.jl
index 645e97f..e0657c8 100644
--- a/src/ReactionNetworkImporters.jl
+++ b/src/ReactionNetworkImporters.jl
@@ -24,7 +24,7 @@ struct ParsedReactionNetwork
     rn::ReactionSystem
 
     "Dict mapping initial condition symbolic variables to values."
-    u₀::Any
+    u0::Any
 
     "Dict mapping parameter symbolic variables to values."
     p::Any
@@ -35,9 +35,9 @@ struct ParsedReactionNetwork
     "Dict from group name (as string) to corresponding symbolic variable"
     groupstosyms::Any
 end
-function ParsedReactionNetwork(rn::ReactionSystem; u₀ = nothing, p = nothing,
+function ParsedReactionNetwork(rn::ReactionSystem; u0 = nothing, p = nothing,
                                varstonames = nothing, groupstosyms = nothing)
-    ParsedReactionNetwork(rn, u₀, p, varstonames, groupstosyms)
+    ParsedReactionNetwork(rn, u0, p, varstonames, groupstosyms)
 end
 
 export BNGNetwork, MatrixNetwork, ParsedReactionNetwork, ComplexMatrixNetwork