diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index faeca1adf3..fa9c7e4f62 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -38,7 +38,7 @@ A pull request may be asked to fix the coding style before submission.
 In other cases, a pull request may be followed up with a "style nit commit".
 
 ## Non-obvious things:
-  - Code should be both ISO C99 and ISO C++ compatible. This dual requirement is for XBox360 and MSVC in general. Think of it as a C++ compatible subset of C99.
+  - Code should be both C89 and ISO C++ compatible. This dual requirement is for XBox360 and MSVC in general. Think of it as a C++ compatible subset of C99.
   - Warnings are not allowed (-Wall). Make sure your code is warning-free. Note that warning sensitivity differs a bit across compiler versions.
   - Using deprecated APIs is discouraged.
 
@@ -55,4 +55,4 @@ We value discussing things in "real-time".
 
 # Commit Access
 Contributors who show a track record of making good pull requests over time will eventually get commit access to the repo.
-This typically happens when the "overhead" of looking through pull requests over time becomes a burden.
\ No newline at end of file
+This typically happens when the "overhead" of looking through pull requests over time becomes a burden.