diff --git a/README.md b/README.md
index 81c6de5..5255003 100644
--- a/README.md
+++ b/README.md
@@ -50,6 +50,8 @@ broadlink.setup('myssid', 'mynetworkpass', 3)
 
 Security mode options are (0 = none, 1 = WEP, 2 = WPA1, 3 = WPA2, 4 = WPA1/2)
 
+If the device fails to connect to the network, make sure the SSID and password only contain alphanumeric characters (no dots, dashes, etc.)
+
 #### Advanced options
 
 You may need to specify a broadcast address if setup is not working.