diff --git a/src/bmp.h b/src/bmp.h
--- a/src/bmp.h
+++ b/src/bmp.h
@@ -14,7 +14,7 @@ struct BmpInfo {
 	bool os2_bmp;        ///< true if OS/2 1.x or windows 2.x bitmap
 	uint16 bpp;          ///< bits per pixel
 	uint32 compression;  ///< compression method (0 = none, 1 = 8-bit RLE, 2 = 4-bit RLE)
-	uint32 palette_size; ///< number of colors in palette
+	uint32 palette_size; ///< number of colours in palette
 };
 
 struct BmpData {