diff --git a/.travis.yml b/.travis.yml
index 4338772fe..63c293370 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,5 +8,8 @@ jdk:
 services:
   - redis-server
 install: true
+# The environment variable ${TRAVIS_PULL_REQUEST} is set to "false" when the build 
+# is for a normal branch commit. When the build is for a pull request, it will 
+# contain the pull request’s number.
 script
-  - '[ "${TRAVIS_PULL_REQUEST}" != "false" ] || ./mvnw -s .settings.xml package -nsu -Dmaven.test.redirectTestOutputToFile=false
\ No newline at end of file
+  - '[ "${TRAVIS_PULL_REQUEST}" != "false" ] || ./mvnw -s .settings.xml package -nsu -Dmaven.test.redirectTestOutputToFile=false'