diff --git a/Gantt.md b/Gantt.md
index 6a86f3d..206071f 100644
--- a/Gantt.md
+++ b/Gantt.md
@@ -1,3 +1,9 @@
+# What is this?
+
+Original Wekan is MIT-licensed software.
+
+This different Gantt version here currently uses Gantt chart component that has GPL license, so this Wekan Gantt version is GPL licensed.
+
 # How to use
 
 [Source](https://github.com/wekan/wekan/issues/2870#issuecomment-721690105)