diff --git a/tools/md5_to_dsma/md5_to_dsma.py b/tools/md5_to_dsma/md5_to_dsma.py
index 629b47c..6e8a220 100755
--- a/tools/md5_to_dsma/md5_to_dsma.py
+++ b/tools/md5_to_dsma/md5_to_dsma.py
@@ -666,7 +666,8 @@ def convert_md5mesh(model_file, name, output_folder, texture_size,
                 # -------
 
                 st = vert.st
-
+                # In the MD5 format (0, 0) is the top-left corner, same as what
+                # the GPU of the DS expects.
                 u = st[0] * texture_size[0]
                 v = st[1] * texture_size[1]
                 dl.texcoord(u, v)
diff --git a/tools/obj2dl/obj2dl.py b/tools/obj2dl/obj2dl.py
index d89e945..6ac40e9 100755
--- a/tools/obj2dl/obj2dl.py
+++ b/tools/obj2dl/obj2dl.py
@@ -130,8 +130,8 @@ def convert_obj(input_file, output_file, texture_size,
 
             if texcoord_index is not None:
                 u, v = texcoords[texcoord_index]
-                # On OBJ, (0, 0) is the bottom-left corner. On the DS, (0, 0) is
-                # the top left corner. This flips the top and the bottom.
+                # In the OBJ format (0, 0) is the bottom-left corner. In the DS,
+                # (0, 0) is the top left corner. We need tp flip top and bottom.
                 v = 1.0 - v
                 u *= texture_size[0]
                 v *= texture_size[1]