diff --git a/World-map-generation.md b/World-map-generation.md
index e3fa84d..f117473 100644
--- a/World-map-generation.md
+++ b/World-map-generation.md
@@ -1,8 +1,8 @@
 The Release package includes a map, however you can create your own following simple rules:
 
-* `world_map.jpg` should be square
+* `world_map.jpg` should be square (i.e. 32768 x 32768 px)
 * The projection of the map is Mercator based on the World Geodetic System (WGS) 1984 geographic coordinate system (datum)
-* Longitude and latitude cover the map from -180 to 180 and -85 to 85, respectively. Note that latitude does not go up to 90 (since most available maps do not include the initial degrees
+* Longitude and latitude cover the map from -180 to 180 and -85 to 85, respectively. Note that latitude does not go up to 90 (since most available maps do not include the 5 initial degrees)
 
-With those conditions fullfilled, place the input map in: `sdcard/ADSB/world_map.jpg` and then run `firmware/tools/generate_world_map.bin.py`. Your map will be generated on: `sdcard/ADSB/world_map.bin`
+With those conditions fulfilled, place the input map in: `sdcard/ADSB/world_map.jpg` and then run `firmware/tools/generate_world_map.bin.py`. Your map will be generated on: `sdcard/ADSB/world_map.bin`