diff --git a/README.md b/README.md
index 41ff8cd..898505e 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,10 @@ Apple HGR to RGB NTSC
 Usage:
 ======
 
-`bin/hgr2rgb.exe [-bmp | -tga] filename
+`bin/hgr2rgb.exe [-bmp | -tga] filename`
+
+  -tga   Output to .tga (default)
+  -bmp   Output to .bmp
 
 Example:
 ========