diff --git a/src/genjava/templates/genjava_project/build.gradle.in b/src/genjava/templates/genjava_project/build.gradle.in
index f2da1228141fe8ae613bb99ca8899433ca569922..47082b006c8668b1dc9b4891e2055b71040d67c6 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/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"