diff --git a/.github/workflows/docker-amd64.yml b/.github/workflows/docker-amd64.yml
index 038e1ff2..5ae7252c 100644
--- a/.github/workflows/docker-amd64.yml
+++ b/.github/workflows/docker-amd64.yml
@@ -44,6 +44,7 @@ on:
   workflow_dispatch:
 
 concurrency:
+  # only cancel in-progress jobs or runs for the current workflow - matches against branch & tags
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 31d3f3db..edc73b5b 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -44,6 +44,7 @@ on:
   workflow_dispatch:
 
 concurrency:
+  # only cancel in-progress jobs or runs for the current workflow - matches against branch & tags
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true