diff --git a/README.md b/README.md
index 451398e..4946f9c 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,8 @@ Two variables in the post description can be give (see the `config.json.example`
 
 Usage: `./pixelfed_batch_uploader ../../Downloads/Instagram-Backup/media/posts/201406 --title "June 2014"`
 
+The `config.json` must be in the same directory the program is called from (`$PWD`)
+
 
 [![asciicast](https://asciinema.mxhdr.net/a/6.svg)](https://asciinema.mxhdr.net/a/6)