1 files changed, 1 insertions, 0 deletions
diff --git a/alphagen.c b/alphagen.c
index 9d3cd54..4a3d4e2 100644
--- a/alphagen.c
+++ b/alphagen.c
@@ -88,6 +88,7 @@ bool alphagen(char *black_name, char *white_name, char *alpha_name)
 		return false;
 	}
 
+	/* Return failure if there's a problem with the input images. */
 	if (!alphagen_check_inputs(&b, &w)) {
 		return false;
 	}