diff --git a/.gitignore b/.gitignore
index f4124a2..c072661 100644
--- a/.gitignore
+++ b/.gitignore
@@ -102,3 +102,7 @@ docs/
 
 # Superpowers SDD scratch (briefs, reports, ledger)
 .superpowers/
+
+# Internal design docs (plans and specs) are kept out of the repo.
+plans/
+specs/