diff --git a/PROMPT.md b/PROMPT.md
index 9854c06..bdfb87d 100644
--- a/PROMPT.md
+++ b/PROMPT.md
@@ -7,6 +7,7 @@ Keep files small and focused.
 Target <100 LOC per file unless there is a clear and 
 documented reason otherwise. 
 Enforce one responsibility per file.
+Lockfiles are excluded from the LOC target.
 
 Decompose aggressively. 
 Break up large blobs of logic into composable units.