diff --git a/README b/README
index cd91344..302cfb6 100755
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-tty-clock usage : tty-clock -[option] <arg>
+tty-clock usage : tty-clock [-option] <arg>
   -s, --second        Show seconds
   -b, --lock          Lock the keyboard
   -t, --twelve        Set the hour in 12h format
diff --git a/ttyclock.h b/ttyclock.h
index 0213844..3b3b300 100644
--- a/ttyclock.h
+++ b/ttyclock.h
@@ -48,7 +48,7 @@
 #define DATEWINH   3
 
 /* Help string */
-#define HELPSTR "tty-clock usage : tty-clock -[option] <arg>    \n\
+#define HELPSTR "tty-clock usage : tty-clock [-option] <arg>    \n\
    -s, --second     Show seconds                                \n\
    -l, --lock       Lock the keyboard                           \n\
    -c, --center     Set the clock at the center of the terminal \n\