diff --git a/backend/bmp.c b/backend/bmp.c
index 6b3beab6..24b7a9bd 100644
--- a/backend/bmp.c
+++ b/backend/bmp.c
@@ -1,4 +1,4 @@
-/* bmp.c - Handles output to PNG file */
+/* bmp.c - Handles output to Windows Bitmap file */
 
 /*
     libzint - the open source barcode library