diff --git a/CLAUDE.md b/CLAUDE.md
index 554272525..7af31300e 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -12,3 +12,4 @@
 - NEVER update all dependencies in the lockfile and ALWAYS use `cargo update --precise` to make
   lockfile changes
 - NEVER assume clippy warnings are pre-existing, it is very rare that `main` has warnings
+- ALWAYS read and copy the style of similar tests when adding new cases