diff --git a/Documentation/git-backfill.txt b/Documentation/git-backfill.txt
index 066ec6b161a22c..2e1f8505209cbb 100644
--- a/Documentation/git-backfill.txt
+++ b/Documentation/git-backfill.txt
@@ -9,7 +9,7 @@ git-backfill - Download missing objects in a partial clone
 SYNOPSIS
 --------
 [verse]
-'git backfill' [--batch-size=<n>] [--[no-]sparse]
+(EXPERIMENTAL) 'git backfill' [--batch-size=<n>] [--[no-]sparse]
 
 DESCRIPTION
 -----------
diff --git a/builtin/backfill.c b/builtin/backfill.c
index d37516b045036e..ea8558b5041c44 100644
--- a/builtin/backfill.c
+++ b/builtin/backfill.c
@@ -25,7 +25,7 @@
 #include "path-walk.h"
 
 static const char * const builtin_backfill_usage[] = {
-	N_("git backfill [--batch-size=<n>] [--[no-]sparse]"),
+	N_("(EXPERIMENTAL) git backfill [--batch-size=<n>] [--[no-]sparse]"),
 	NULL
 };