diff --git a/.travis.yml b/.travis.yml
index 991e8e3..aee66f2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,5 +14,6 @@ script:
   - go install .
   - maintainer --help
 
+# Build and push the Docker image to Docker Hub if the build is in master branch.
 after_script: 
   - 'if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then bash ./scripts/master-build-in-travis.sh; fi'