diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 13d17ecee3..f86990b5a7 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -7,6 +7,7 @@ on:
       - master
   workflow_dispatch:
 
+# Free runner capacity by cancelling superseded PR runs.
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: ${{ github.event_name == 'pull_request' }}