diff --git a/docs/expert/p5-operations/installation-maintenance.md b/docs/expert/p5-operations/installation-maintenance.md
index ed43270695aff673ce7e3e9c16656406ae8107fd..8710cc66e4508b79e906af8c91939bf8df844db7 100644
--- a/docs/expert/p5-operations/installation-maintenance.md
+++ b/docs/expert/p5-operations/installation-maintenance.md
@@ -12,6 +12,20 @@ Failing to follow the instructions or failing to react to unexpected events can
     * System modifications to the GEM machines can (but should not) be carried on by members of the `gemsudoers` group.
     * Traditionally, the `gempro` and `gemsudoers` groups are kept in sync' and meant for DAQ experts; the `cms_gem_librarian` is a sub-group meant for administrators and superusers.
 
+!!! warning
+    All CTP7 volumes are kept in read-only mode during normal operations in order to avoid data corruption in case of a sudden power cut.
+    During backend boards maintenance, the `/mnt/persistent` partition must be remounted in read-write mode:
+    ``` sh
+    # from gempro@gemvm-control
+    mussh -m 13 -H /gemdata/config/ctp7-ge* -l root -c 'mount -o remount,rw /mnt/persistent'
+    ```
+    Do no forget to put back the partition in read-only mode after maintenance:
+    ``` sh
+    # from gempro@gemvm-control
+    mussh -m 13 -H /gemdata/config/ctp7-ge* -l root -c 'mount -o remount,ro /mnt/persistent'
+    ```
+    Such an operation is taken care of automatically in the `push-configuration.sh` script & co.
+
 ## Online software
 
 ### Client software