diff --git a/editions/tw5.com/tiddlers/releasenotes/5.4.0/#8972 - parenthesised-field-names.tid b/editions/tw5.com/tiddlers/releasenotes/5.4.0/#8972 - parenthesised-field-names.tid
new file mode 100644
index 000000000..f15df5f1d
--- /dev/null
+++ b/editions/tw5.com/tiddlers/releasenotes/5.4.0/#8972 - parenthesised-field-names.tid	
@@ -0,0 +1,20 @@
+title: $:/changenotes/5.4.0/#8972/impacts/parenthesised-field-names
+changenote: $:/changenotes/5.4.0/#8972
+created: 20260609193636000
+modified: 20260609193636000
+tags: $:/tags/ImpactNote
+impact-type: compatibility-break
+description: A field name containing round brackets can no longer be used as a filter operator suffix, because `(` now starts a multi value variable operand.
+
+Two filter operators take a field name in the suffix position: `regexp` and `search`. Up to 5.3.8 such a field name could contain round brackets, for example:
+
+```
+[regexp:_cd-work(s)[(?i)suite]]
+[search:_cd-work(s)[suite]]
+```
+
+In 5.4.0 the new `(varname)` operand syntax for [[Multi-Valued Variables]] makes `(` start an operand. The parser now splits such a field name at the `(`, so the filter no longer matches.
+
+This will not be fixed. The two readings of `field(x)`, a field named `field(x)` versus the field `field` with the operand `(x)`, are genuinely ambiguous, so `(` and `)` are reserved in filter operator names and suffixes from 5.4.0 onwards.
+
+Workaround: do not use `(` or `)` in field names that are referenced as a filter operator suffix. Rename the field, for example `_cd-works`.
diff --git a/editions/tw5.com/tiddlers/wikitext/Description Lists in WikiText.tid b/editions/tw5.com/tiddlers/wikitext/Description Lists in WikiText.tid
index 6aa4be904..619be20ba 100644
--- a/editions/tw5.com/tiddlers/wikitext/Description Lists in WikiText.tid	
+++ b/editions/tw5.com/tiddlers/wikitext/Description Lists in WikiText.tid	
@@ -7,7 +7,7 @@ type: text/vnd.tiddlywiki
 
 !! Basic syntax
 
-HTML description lists (<abbr title="also known as">AKA</abbr> definition lists) are created with this syntax: 
+HTML description lists (<abbr title="also known as">AKA</abbr> definition lists) are created with this syntax:
 
 <<wikitext-example src:"; Term being described
 : Description / Definition of that term
@@ -17,7 +17,7 @@ HTML description lists (<abbr title="also known as">AKA</abbr> definition lists)
 
 !! Multiple terms and descriptions
 
-You can create multiple descriptions for a term, or multiple terms for a single description:
+You can create multiple descriptions for a term, or multiple terms with a single description:
 
 <<wikitext-example src:"; Mouse
 : A rodent with a small body and a long tail
@@ -41,4 +41,4 @@ Description lists may also be nested to create lists within lists:
 ::: A coffee made with espresso and steamed milk
 ; Tea
 : A beverage typically made from tea leaves
-">>
+">>
\ No newline at end of file
diff --git a/licenses/cla-individual.md b/licenses/cla-individual.md
index 10f2b5a49..ba6fad2eb 100644
--- a/licenses/cla-individual.md
+++ b/licenses/cla-individual.md
@@ -650,4 +650,5 @@ Rishu kumar, @rishu-7549, 2025/10/25
 
 Himmel, @NotHimmel, 2026/03/19
 
-@sean-clayton, 2026/05/16
\ No newline at end of file
+
+@vuktw, 2026/07/12