diff --git a/documentation/user_slack/add.md b/documentation/user_slack/add.md
index 76fd29cc..99740647 100644
--- a/documentation/user_slack/add.md
+++ b/documentation/user_slack/add.md
@@ -9,4 +9,4 @@ You have to register new account on our [Spectrum 2 Web Interface](https://slack
 
 Following is the video showing whole process:
 
-<iframe width="420" height="315" src="https://www.youtube.com/embed/lfPsey60RIs" frameborder="0" allowfullscreen></iframe>
+<iframe width="630" height="472" src="https://www.youtube.com/embed/lfPsey60RIs" frameborder="0" allowfullscreen></iframe>