diff --git a/src/genjava/templates/genjava_project/build.gradle.in b/src/genjava/templates/genjava_project/build.gradle.in
index f2da1228141fe8ae613bb99ca8899433ca569922..a68c29fa78926a1627b7aa76fb838f2dff0435e2 100644
--- a/src/genjava/templates/genjava_project/build.gradle.in
+++ b/src/genjava/templates/genjava_project/build.gradle.in
@@ -67,6 +67,12 @@ jar {
     }
 }
 
+/* Uncomment the following lines in package://genjava/src/genjava/templates/genjava_project/build.gradle.in to
+ * enable Java 6 cross compilation for ROS messages.
+ */
+// sourceCompatibility = 1.6
+// targetCompatibility = 1.6
+
 task info {
     doLast {
         println "\nProject Info"