diff --git a/Server-Diagnostics---Troubleshooting.md b/Server-Diagnostics---Troubleshooting.md
index 0ac7c8b..cbf4af3 100644
--- a/Server-Diagnostics---Troubleshooting.md
+++ b/Server-Diagnostics---Troubleshooting.md
@@ -6,7 +6,7 @@ Since 3.0.0 a special command exists to verify the storage of the collections:
 
 ```
 ## as user "radicale" (or the user which "owns" the storage)
-/usr/bin/radicale --verify-storage
+/usr/bin/radicale --verify-storage --logging-level debug
 ```
 
 It should not report any errors, otherwise particular VCF or ICS files have to be fixed manually.