clarify supported image types

Signed-off-by: Asbjørn Sloth Tønnesen <asbjorn@asbjorn.biz>

1 files changed, 1 insertions, 1 deletions

diff --git a/ql570.c b/ql570.c
index 8034ca7..4ed80a4 100644
--- a/ql570.c
+++ b/ql570.c
@@ -158,7 +158,7 @@ pngdata_t * loadpng(const char * path)
 	}
 
 	if (type == 0) {
-		fprintf(stderr, "Invalid PNG! Only mono or 4x8-bit RGBA PNG files are allowed\n");
+		fprintf(stderr, "Invalid PNG! Only mono or mono 4x8-bit RGBA PNG files are allowed\n");
 		exit(1);
 	}