explain usage in format command when arg isn't YES

diff --git a/movement/filesystem.c b/movement/filesystem.c
index a1953bc6119615339b3dbd319a77065e1c784627..326db74c0070b68a54f363d8d8aa97029c15318c 100644 (file)
--- a/movement/filesystem.c
+++ b/movement/filesystem.c
@@ -272,6 +272,7 @@ int filesystem_cmd_format(int argc, char *argv[]) {
     if(strcmp(argv[1], "YES") == 0) {
         return _filesystem_format();
     }
+    printf("usage: format YES\r\n");
     return 1;
 }