Fix Issue5416 - explain negative value of maxplit in str.replace.
diff --git a/Lib/string.py b/Lib/string.py
index 6faa1f0..9477268 100644
--- a/Lib/string.py
+++ b/Lib/string.py
@@ -513,7 +513,8 @@
Return a copy of string str with all occurrences of substring
old replaced by new. If the optional argument maxsplit is
- given, only the first maxsplit occurrences are replaced.
+ given, only the first maxsplit occurrences are replaced. A
+ negative value of maxsplit signifies all occurances.
"""
return s.replace(old, new, maxsplit)