diff --git a/sdcard/README.md b/sdcard/README.md
index 807baad75d88ce3de7c201c572a0be5a6f5237b4..684807502eae937167cb50162ccae9e85f2b010a 100644
--- a/sdcard/README.md
+++ b/sdcard/README.md
@@ -4,7 +4,7 @@ World_map.bin is required if you want to use the world map view in some apps. It
 
 Since Github doesn't allow uploading such large files, you must generate it yourself from the provided jpg file.
 
-1. Make sur that `world_map.jpg` is in `/sdcard/ADSB`.
+1. Make sure that `world_map.jpg` is in `/sdcard/ADSB`.
 1. Go in `/firmware/tools`.
 1. Run 'python adsb_map.py'. Give it some time.
 1. `world_map.bin` should appear ! Leave it in the ADSB directory.