diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 312b59474..759421e35 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -1,6 +1,7 @@
 # Build and push verilator docker image when tags are pushed to the repository.
-# The following secrets must be configured in the github repository:
+# The following variable(s) must be configured in the github repository:
 # DOCKER_HUB_NAMESPACE: docker hub namespace.
+# The following secrets must be configured in the github repository:
 # DOCKER_HUB_USER: user name for logging into docker hub
 # DOCKER_HUB_ACCESS_TOKEN: docker hub access token.
 name: Build Verilator Container
@@ -52,7 +53,7 @@ jobs:
       uses: docker/metadata-action@v4
       with:
         images: |
-          ${{ secrets.DOCKER_HUB_NAMESPACE }}/${{ env.image_name }}
+          ${{ vars.DOCKER_HUB_NAMESPACE }}/${{ env.image_name }}
         tags: |
           type=match,pattern=(v.*),group=1,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
           type=raw,value=${{ inputs.manual_tag }},enable=${{ inputs.manual_tag != '' }}