diff --git a/changelog.d/399.misc b/changelog.d/399.misc
new file mode 100644
index 00000000..5b11acce
--- /dev/null
+++ b/changelog.d/399.misc
@@ -0,0 +1 @@
+Improve error messasge raised `m.login.application_service` is not provided by the homeserver.
\ No newline at end of file
diff --git a/src/bridge.ts b/src/bridge.ts
index d84f8e79..1ac7b00c 100644
--- a/src/bridge.ts
+++ b/src/bridge.ts
@@ -1690,7 +1690,10 @@ export class Bridge {
             const loginFlows: {flows: {type: string}[]} =
                 await this.botSdkAS.botClient.doRequest("GET", "/_matrix/client/r0/login");
             if (!EncryptedEventBroker.supportsLoginFlow(loginFlows)) {
-                throw Error('To enable support for encryption, your homeserver must support MSC2666');
+                throw Error(
+                    'To enable support for encryption, your homeserver must support m.login.application_service.' +
+                    ' This was introduced in Matrix 1.2.'
+                );
             }
         }
     }