diff --git a/Quickstart.md b/Quickstart.md
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@@ -22,7 +22,7 @@ Open a command line and change to the subdirectory `bin` where the release has b
 
 ## Set up an account
 
-For linking with an existing (master) device, see [[Linking-other-devices-(Provisioning)]]. For registering a new master device, follow the steps below.
+For linking with an existing (master) device, see [[Linking-other-devices-(Provisioning)]]. For registering a new master device, follow the steps below. Usually registration requires to solve a CAPTCHA, see [[Registration with captcha]] for more details.
 
 Note: In Signal/signal-cli the account is called "username", which is slightly misleading, since it is a phone number including the country code. The used phone number is required for one-time verification of the installation. In this example I will use two German cell phone numbers, thus they will start with +491515...