diff --git a/Getting-Started/Configuration-Guide.md b/Getting-Started/Configuration-Guide.md
index 3ac8bbae1..8b3fdc301 100644
--- a/Getting-Started/Configuration-Guide.md
+++ b/Getting-Started/Configuration-Guide.md
@@ -439,6 +439,7 @@ backend_write_timeout=2
 
 # galeramon specific options
 disable_master_failback=0
+available_when_donor=0
 ```
 
 #### `module`
@@ -503,6 +504,12 @@ The server status field may have the `SERVER_MASTER_STICKINESS` bit, meaning the
 
 Anyway, a new master will be selected in case of current master failure, regardless the option value.
 
+#### `available_when_donor`
+
+This option if set to 1 will allow Galera monitor to keep a node in `Donor` status in the server pool if it is using any xtrabackup method for SST, e.g. `wsrep_sst_method` equal to `xtrabackup` or `xtrabackup-v2`.
+
+As xtrabackup is a non-locking SST method, a node in `Donor` status can still be considered in sync. This option is not enabled by default and should be used as the administrator's discretion.
+
 #### `backend_connect_timeout`
 
 This option, with default value of `3` sets the monitor connect timeout to backends.