diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 909e77e..89d6f02 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1874,7 +1874,7 @@ static int update_clone(int argc, const char **argv, const char *prefix)
 	};
 
 	const char *const git_submodule_helper_usage[] = {
-		N_("git submodule--helper update_clone [--prefix=<path>] [<path>...]"),
+		N_("git submodule--helper update-clone [--prefix=<path>] [<path>...]"),
 		NULL
 	};
 	suc.prefix = prefix;