diff --git a/bmon.c b/bmon.c
index 17d2797..d4b0eef 100644
--- a/bmon.c
+++ b/bmon.c
@@ -16,7 +16,12 @@ int dead = 0;
 
 void usage (void)
 {
-	printf("usage: bmon [-wuh] [-f file] [-t interval]\n");
+	printf("usage: bmon [-wuh] [-f file] [-t interval]\n"
+	"-w\tDisplay power draw from battery\n"
+	"-u\tPrint seconds as epoch\n"
+	"-h\tPrint this message\n"
+	"-f\tWrite output to file\n"
+	"-t\tSet the update interval in seconds\n");
 }
 
 void int_handler (int signum)