diff --git a/errno/errno.c b/errno/errno.c
index ef09e34..8ee3b97 100644
--- a/errno/errno.c
+++ b/errno/errno.c
@@ -4,7 +4,7 @@
 
 char *cmnd;
 
-void usage(void) {
+static void usage(void) {
     fprintf(stderr, "Usage: %s errno ...\n", cmnd);
     exit(1);
 }
@@ -15,12 +15,20 @@ int main(int argc, char **argv) {
 
     cmnd = argv[0];
 
-    if (argc <= 1) usage();
+    if (argc <= 1) {
+	int e;
+	for (e = 0;; e++) {
+	    printf("%d\t%s\n", e, strerror(e));
+	}
+    } else {
+	for (i = 1; i < argc; i++) {
+	    int e = strtoul(argv[i], NULL, 0);
 
-    for (i = 1; i < argc; i++) {
-	int e = strtoul(argv[i], NULL, 0);
-
-	printf("%d\t%s\n", e, strerror(e));
+	    printf("%d\t%s\n", e, strerror(e));
+	}
     }
     return 0;
 }
+/*
+ * vim:sw=4
+ */