diff --git a/Lib/imaplib.py b/Lib/imaplib.py
index f803a5cbfe0..ec476572abe 100644
--- a/Lib/imaplib.py
+++ b/Lib/imaplib.py
@@ -740,7 +740,7 @@ def subscribe(self, mailbox):
     def thread(self, threading_algorithm, charset, *search_criteria):
         """IMAPrev1 extension THREAD command.
 
-        (type, [data]) = <instance>.thread(threading_alogrithm, charset, search_criteria, ...)
+        (type, [data]) = <instance>.thread(threading_algorithm, charset, search_criteria, ...)
         """
         name = 'THREAD'
         typ, dat = self._simple_command(name, threading_algorithm, charset, *search_criteria)