diff --git a/docker/build.sh b/docker/build.sh
index d4468a9..180b64e 100755
--- a/docker/build.sh
+++ b/docker/build.sh
@@ -2,8 +2,9 @@
 # =============================================================================
 # ngn-agent Docker Image Build Script
 #
+# D-04: Single-command build entry point at docker/build.sh.
 # Builds the custom Hermes Docker image with platform engineering tools.
-# Tag: ngn-agent:latest (local only, no registry push — per D-05)
+# D-05: Tag: ngn-agent:latest (local only, no registry push).
 # =============================================================================
 set -euo pipefail