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diff --git a/CLAUDE.md b/CLAUDE.md
index 8a6539c..0ad2606 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -20,6 +20,14 @@ cargo run                 # Run in debug mode with REPL shell
 cargo build              # Build debug version
 ```
 
+## Instructions
+
+Always run the `zig fmt` to format source code after every change.  Example:
+
+```
+find . -name \*.zig -exec 'zig' 'fmt' '{}' ';'
+```
+
 ## Architecture
 
 ### Command System Design