diff --git a/src/TODO b/src/TODO
index 909a3a9..253a2dd 100644
--- a/src/TODO
+++ b/src/TODO
@@ -1,9 +1,3 @@
-basename:
-- separate usage()
-
-dirname:
-- separate usage()
-
 id:
 - write more readable code
 - check if it's complete
diff --git a/src/dirname.c b/src/dirname.c
index 0279612..5f2f503 100644
--- a/src/dirname.c
+++ b/src/dirname.c
@@ -6,15 +6,20 @@
 #include <stdio.h>
 
 
+/* usage */
+static int usage(void)
+{
+	fprintf(stderr, "%s", "Usage: dirname string\n");
+	return 1;
+}
+
+
 /* main */
 int main(int argc, char * argv[])
 {
 	/* check for errors */
 	if(argc != 2)
-	{
-		fprintf(stderr, "%s", "Usage: dirname string\n");
-		return 1;
-	}
+		return usage();
 	/* dirname */
 	printf("%s\n", dirname(argv[1]));
 	return 0;