diff --git a/HowToUbuntu.md b/HowToUbuntu.md
index d22982e..7071c91 100644
--- a/HowToUbuntu.md
+++ b/HowToUbuntu.md
@@ -35,6 +35,8 @@ After a few seconds, you will receive an SMS on the cell phone with phone number
 > Your TextSecure verification code: **123-456**
 > 25 Feb. 2017 10:52
 
+Note: You can register Signal using a land line number. In this case you can skip SMS verification process and jump directly to the voice call verification by adding the `--voice` switch at the end of above register command.
+
 2. Verify your phone number
 Enter