diff --git a/stdlib/2and3/imaplib.pyi b/stdlib/2and3/imaplib.pyi
index d24070312..07272ce02 100644
--- a/stdlib/2and3/imaplib.pyi
+++ b/stdlib/2and3/imaplib.pyi
@@ -52,6 +52,8 @@ class IMAP4:
     def create(self, mailbox: str) -> CommandResults: ...
     def delete(self, mailbox: str) -> CommandResults: ...
     def deleteacl(self, mailbox: str, who: str) -> CommandResults: ...
+    if sys.version_info >= (3, 5):
+        def enable(self, capability: str) -> CommandResults: ...
     def expunge(self) -> CommandResults: ...
     def fetch(self, message_set: str, message_parts: str) -> CommandResults: ...
     def getacl(self, mailbox: str) -> CommandResults: ...