Update README.md

README.md

@@ -24,6 +24,7 @@ Use local tile source:
 python tiles_to_tiff file:///Users/Bob/local-directory 21.49147 65.31016 21.5 65.31688 -o output -z 17
 ```
 
+#### TMS Tiles
 In the tile source there is the ability to use {-y} in the URL. In TMS, the origin of coordinates is the bottom left corner so the Y coordinate goes up.
 
 ### CLI arguments:
@@ -33,4 +34,4 @@ In the tile source there is the ability to use {-y} in the URL. In TMS, the orig
 - `lng_max` - Max longitude of bounding box
 - `lat_max` - Max latitude of bounding box
 - `-z, --zoom` - Tilesource zoom level, default 14
-- `-o, --output` - Output directory, required
+- `-o, --output` - Output directory, required