diff --git a/b454-nixos-module-execstartpre-datadir.md b/b454-nixos-module-execstartpre-datadir.md
index 67e4b9d..db538f4 100644
--- a/b454-nixos-module-execstartpre-datadir.md
+++ b/b454-nixos-module-execstartpre-datadir.md
@@ -54,6 +54,13 @@ serviceConfig = {
 
 ## Progress
 
+### 2026-01-20 [Session 10:30] - Verification Complete
+- Completed: All verification tests passed successfully
+- Verified: ExecStartPre directives work correctly on NixOS deployment
+- Tested: Fresh install, idempotency, permission correction, ownership correction
+- Result: Service starts successfully with auto-created directories
+- Status: Ready to merge to main
+
 ### 2026-01-20 [Session 09:00] - Testing Strategy Review
 - Reviewed: Implementation in commit f93fc0a691544cc3ddda322a7e99d0534d636dcc
 - Designed: Comprehensive testing strategy for NixOS deployment