diff --git a/Maven.gitignore b/Maven.gitignore
index e8d57d08..0e13eebb 100644
--- a/Maven.gitignore
+++ b/Maven.gitignore
@@ -7,4 +7,5 @@ release.properties
 dependency-reduced-pom.xml
 buildNumber.properties
 .mvn/timing.properties
+# https://github.com/takari/maven-wrapper#usage-without-binary-jar
 .mvn/wrapper/maven-wrapper.jar