diff --git a/apps/user_ldap/lib/User/User.php b/apps/user_ldap/lib/User/User.php
index 392cb2e51b..5d4af1fd09 100644
--- a/apps/user_ldap/lib/User/User.php
+++ b/apps/user_ldap/lib/User/User.php
@@ -459,6 +459,20 @@ class User {
 	}
 
 	/**
+	 * Overall process goes as follow:
+	 * 1. fetch the quota from LDAP and check if it's parseable with the "verifyQuotaValue" function
+	 * 2. if the value can't be fetched, is empty or not parseable, use the default LDAP quota
+	 * 3. if the default LDAP quota can't be parsed, use the ownCloud's default quota (use 'default')
+	 * 4. check if the target user exists and set the quota for the user.
+	 *
+	 * In order to improve performance and prevent an unwanted extra LDAP call, the $valueFromLDAP
+	 * parameter can be passed with the value of the attribute. This value will be considered as the
+	 * quota for the user coming from the LDAP server (step 1 of the process) It can be useful to
+	 * fetch all the user's attributes in one call and use the fetched values in this function.
+	 * The expected value for that parameter is a string describing the quota for the user. Valid
+	 * values are 'none' (unlimited), 'default' (the ownCloud's default quota), '1234' (quota in
+	 * bytes), '1234 MB' (quota in MB - check the \OC_Helper::computerFileSize method for more info)
+	 *
 	 * fetches the quota from LDAP and stores it as ownCloud user value
 	 * @param string $valueFromLDAP the quota attribute's value can be passed,
 	 * to save the readAttribute request