diff --git a/action.yml.erb b/action.yml.erb
index 916be04..226285b 100644
--- a/action.yml.erb
+++ b/action.yml.erb
@@ -15,6 +15,10 @@ inputs:
     description: 'Publishes posts with a future date.'
     required: false
     default: true
+  build_revision:
+    description: 'The SHA-1 of the git commit for which the build is running. Default to GITHUB_SHA when not provided.'
+    required: false
+    default:
   verbose:
     description: 'Verbose output'
     required: false
diff --git a/entrypoint.sh b/entrypoint.sh
index 2de362a..71d3c51 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -17,6 +17,7 @@ GITHUB_PAGES=$PAGES_GEM_HOME/bin/github-pages
 export JEKYLL_ENV="production"
 export JEKYLL_GITHUB_TOKEN=$INPUT_TOKEN
 export PAGES_REPO_NWO=$GITHUB_REPOSITORY
+export JEKYLL_BUILD_REVISION=${INPUT_BUILD_REVISION:="$GITHUB_SHA"}
 
 # Set verbose flag
 if [ "$INPUT_VERBOSE" = 'true' ]; then