diff --git a/.gitignore b/.gitignore
index 98c3a20..a2f5328 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,8 +20,9 @@ packages/server/dist
 ROADMAP.md
 pnpm-lock.yaml
 pnpm-workspace.yaml
-# Reference snapshot (read-only, not part of this project)
+# Local design prototypes and reference snapshots (read-only, not part of this project)
 reference_code/
+prototype_reference/
 
 # Server data
 packages/server/data/