diff --git a/README.md b/README.md
index 77f5aac..a89f258 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,6 @@ Installation
 
 * The database structure will be created automatically if it doesn't exist.
 * No special file permissions are needed by default. Optional: If you want to have the JavaScript- and CSS-files minified, the static/asset/ folder has to be writable.
-* You need to have the GD extension for PHP enabled so that the QR codes are rendered.
 * To ensure that pastes with an expiration set get cleaned up, define the cron key in the config and set up a cronjob, for example:
   * */5 * * * * curl --silent http://yoursite.com/cron/[key]
 
diff --git a/doc/TROUBLESHOOTING_GUIDE.md b/doc/TROUBLESHOOTING_GUIDE.md
index 37be3ea..ef169a8 100644
--- a/doc/TROUBLESHOOTING_GUIDE.md
+++ b/doc/TROUBLESHOOTING_GUIDE.md
@@ -37,6 +37,12 @@ PHP FastCGI must be running. See the php-fcgi section under Nginx.
 
 ### Cherokee
 
+### PHP
+
+#### The QR file isn't created and the image isn't showed
+
+You need to have the GD extension for PHP installed and enabled so that the QR codes are rendered.
+
 Still have a problem?
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