REXPaint allows editing up to 9 layers as of v1.03
Eventually unlimited layers will be editable, but that won't come until 2.0.
@@ -322,7 +322,7 @@ bool TCOD_console_save_xp(
* This function can save any number of layers with multiple
* different sizes.
*
- * The REXPaint tool only supports files with up to 4 layers where
+ * The REXPaint tool only supports files with up to 9 layers where
* all layers are the same size.
*/
bool TCOD_console_list_save_xp(
