diff --git a/websh.c b/websh.c
index 0afe423..6263a16 100644
--- a/websh.c
+++ b/websh.c
@@ -15,6 +15,12 @@
 
 static const char *pname;
 
+void usage(void)
+{
+	fprintf(stderr, "Usage: websh [-e] [-h] [-s WORD:TAG]\n");
+	exit(EXIT_FAILURE);
+}
+
 void parse(int argc, char *argv[])
 {
 	int eFlag = 0;