diff --git a/Troubleshooting.md b/Troubleshooting.md
index bbc129f..d23a86e 100644
--- a/Troubleshooting.md
+++ b/Troubleshooting.md
@@ -25,9 +25,12 @@ Two main things could go wrong:
 
 ### Completion problems
 
-*...to be filled...*
+Many completion problems, including the infamous `command not found: compdef`, can be solved by resetting the completion system.
 
+1. First, try to remove your completion cache with `rm ~/.zcompdump*`, close and reopen your shells.
+
+2. If you still have problems, try fully resetting the completion system, as explained by [**@dragon788**](https://github.com/robbyrussell/oh-my-zsh/issues/630#issuecomment-70291622).
 
 ### Everything else
 
-*...to be filled...*
+*...to be filled...*
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