diff --git a/source/includes/authenticated_api/_members.md.erb b/source/includes/authenticated_api/_members.md.erb
index a51109ea90f..e4ad0985741 100644
--- a/source/includes/authenticated_api/_members.md.erb
+++ b/source/includes/authenticated_api/_members.md.erb
@@ -94,6 +94,9 @@ Deletes are synchronous and may take several seconds depending on how many resou
 
 Ownership of Petitions and Events created by the deleted member will be re-assigned to the user account specified in the organisation's settings.
 
+Note that if the member has a user account that is associated with one or more REST API Apps, the member cannot be deleted unless those apps are first deleted through the web UI.
+If the member cannot be deleted for any reason, the JSON response will contain error messages explaining the problem.
+
 <div></div>
 
 
@@ -119,6 +122,9 @@ Anonymization is synchronous and may take several seconds depending on how many
 
 Ownership of Petitions and Events created by the deleted member will be re-assigned to the user account specified in the organisation's settings.
 
+Note that if the member has a user account that is associated with one or more REST API Apps, the member cannot be anonymized unless those apps are first deleted through the web UI.
+If the member cannot be anonymized for any reason, the response will have a 422 Unprocessable Entity status and the JSON body will contain error messages explaining the problem.
+
 <div></div>