diff --git a/README.md b/README.md
index cb2dc58..27b9077 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,8 @@ Usage
                                 specified
           -t, --tail            tail-like operation by continuously appending new
                                 changes (--state option is enable)
+          -w WAIT, --wait=WAIT  number of seconds to wait before refreshing (default
+                        is 60)
 
 ### Sample usage