From c876efc65e0764399b48a4520acb0e0a412ff40e Mon Sep 17 00:00:00 2001
From: ha7ilm <retzlerandras@gmail.com>
Date: Sat, 29 Nov 2014 14:05:39 +0100
Subject: [PATCH] readme tips fix

---
 README.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/README.md b/README.md
index 5a3c5ad..1703964 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,8 @@ I would like to maintain a list of online amateur radio receivers on <a href="ht
 
 ## Usage tips
 
+You can zoom the waterfall display by the mouse wheel.
+
 The filter envelope can be dragged at its ends and moved around to set the passband.
 
 However, if you hold the shift key, you can drag the center line (BFO) or the whole passband (PBS).