diff --git a/.gitignore b/.gitignore
index 28d72ca8..51fb7532 100644
--- a/.gitignore
+++ b/.gitignore
@@ -210,3 +210,4 @@ scripts/test-session*.js
 scripts/test-deliberation*.js
 public/downloads/*claude-code*.pdf
 public/downloads/*governance-in-action*.pdf
+SECURITY_INCIDENT_POST_MORTEM_2025-10-21.md