diff --git a/Documentation/git-filter-repo.txt b/Documentation/git-filter-repo.txt
index c5fb050..4a1d574 100644
--- a/Documentation/git-filter-repo.txt
+++ b/Documentation/git-filter-repo.txt
@@ -1,3 +1,8 @@
+// This file is NOT the documentation; it's the *source code* for it.
+// Please follow the "user manual" link under
+//     https://github.com/newren/git-filter-repo#how-do-i-use-it
+// to access the actual documentation.
+
 git-filter-repo(1)
 ==================