Add item
diff --git a/Doc/whatsnew/whatsnew23.tex b/Doc/whatsnew/whatsnew23.tex
index 0b16acd..f3d5edb 100644
--- a/Doc/whatsnew/whatsnew23.tex
+++ b/Doc/whatsnew/whatsnew23.tex
@@ -228,6 +228,8 @@
 Add optional arg to string methods strip(), lstrip(), rstrip().
 The optional arg specifies characters to delete.
 
+New method: string.zfill()
+
 Add dict method pop().
 
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