perldelta for #23779

Author: khwilliamson

pod/perldelta.pod

@@ -366,7 +366,12 @@ manager will later use a regex to expand these into links.
 
 =item *
 
-XXX
+We have long claimed to support identifiers up to about 255 characters
+long.  However this was actually true only for identifiers that
+consisted of only ASCII characters.  The real upper limit was as little
+as 64 characters for identifiers written in other languages, for
+example, Chinese or Osage.  Now an identifier in any language may
+contain at least 255 characters.
 
 =back