2 files changed, 5 insertions, 0 deletions
diff --git a/Misc/ACKS b/Misc/ACKS
index 893fb2d..abf7304 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -823,6 +823,7 @@ Mark Levitt
 Ivan Levkivskyi
 William Lewis
 Akira Li
+Robert Li
 Xuanji Li
 Robert van Liere
 Ross Light
diff --git a/Misc/NEWS b/Misc/NEWS
index 7d673b2..3d4cbcb 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -96,6 +96,10 @@ Core and Builtins
 Library
 -------
 
+- Issue #21827: Fixed textwrap.dedent() for the case when largest common
+  whitespace is a substring of smallest leading whitespace.
+  Based on patch by Robert Li.
+
 - Issue #25471: Sockets returned from accept() shouldn't appear to be
   nonblocking.