diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 79e26aca..87790e3a 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -87,7 +87,7 @@ Often the simplest code is easier to read, easier to maintain and more efficient
 Most of the syntax is handled by a modified version of zig fmt and checked by the CI (see the formatting section above).
 
 There are a few more things not covered by the formatter:
-- **Naming conventions:** camelCase for variables, constants (no all-caps constants please!) and functions; CapitalCamelCase for types
+- **Naming conventions:** camelCase for variables, constants (no all-caps constants please!) and functions; CapitalCamelCase for types; snake_case for files and namespaces
 - **Line limit:** There is no line limit (I hate seeing code that gets wrapped over by 1 word, because of an arbitrary line limit), but of course try to be reasonable. If you need 200 characters, then you should probably consider splitting it or adding some well-named helper variables.
 - **Comments:** Don't write comments, unless there is something non-obvious going on that needs to be explained.<br>
   But in either case it's better to write readable code with descriptive names, instead of writing long comments, since comments will naturally degrade over time as the surrounding code changes.<br>