diff --git a/script/check b/script/check
index e6879443..b31fd795 100755
--- a/script/check
+++ b/script/check
@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
-# Fast compile-only check: no frontend build, no clippy, no tests.
+# Fast compile-only check + doc-coverage check on changed files.
 # Use this for rapid iteration feedback while writing code.
+# Catches the doc-coverage gate failures locally instead of waiting for
+# the merge gate to bounce on a single missing `///`.
 set -euo pipefail
 cargo check --tests --workspace
+cargo run -p source-map-gen --bin source-map-check -- --worktree . --base master