diff --git a/Server-Diagnostics---Troubleshooting.md b/Server-Diagnostics---Troubleshooting.md
index 3ba7c50..0ac7c8b 100644
--- a/Server-Diagnostics---Troubleshooting.md
+++ b/Server-Diagnostics---Troubleshooting.md
@@ -1,5 +1,16 @@
 (work-in-progress, feel free to contribute)
 
+# Storage verification
+
+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
+```
+
+It should not report any errors, otherwise particular VCF or ICS files have to be fixed manually.
+
 # Listen Status
 
 ## Radicale started, it's listen on configured IP/ports