diff --git a/ChangeLog b/ChangeLog
index fce763369..6cd615b47 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2003-07-04  Peter Stephenson  <pws@csr.com>
 
+	* 18571: Doc/Zsh/params.yo: Note easy way of replacing
+	associative array elements using +=.  (Posted ages ago
+	and forgotten about.)
+
 	* 18807: baptiste daroussin <daroussi@ece.fr>:
 	Completion/Linux/Command/.distfiles,
 	Completion/Linux/Command/_pkgtool: Completion for Slackware
diff --git a/Doc/Zsh/params.yo b/Doc/Zsh/params.yo
index 889ab3f85..675a75991 100644
--- a/Doc/Zsh/params.yo
+++ b/Doc/Zsh/params.yo
@@ -257,6 +257,16 @@ patterns used for reverse subscripting (the `tt(r)', `tt(R)', `tt(i)',
 etc. flags), but it may also affect parameter substitutions that appear
 as part of an arithmetic expression in an ordinary subscript.
 
+It is possible to avoid the use of subscripts in assignments to associative
+array elements by using the syntax:
+
+example(
+   aa+=('key with "*strange*" characters' 'value string')
+)
+
+This adds a new key/value pair if the key is not already present, and
+replaces the value for the existing key if it is.
+
 The basic rule to remember when writing a subscript expression is that all
 text between the opening `tt([)' and the closing `tt(])' is interpreted
 em(as if) it were in double quotes (\