diff --git a/make/Javadoc.gmk b/make/Javadoc.gmk
index 3fc4d156aa673039807f19e9af7d56b164c812c2..5ceb531b1dc90fdc43eac6fb3a926754aa0bf2ef 100644
--- a/make/Javadoc.gmk
+++ b/make/Javadoc.gmk
@@ -310,6 +310,13 @@ include NON_CORE_PKGS.gmk
 
 #################################################################
 
+#
+# Load custom Javadoc rules, if present
+#
+-include $(CUSTOM_MAKE_DIR)/Javadoc.gmk
+
+#################################################################
+
 #
 # Default target is same as docs target, create core api and all others it can
 #