diff --git a/changelog.d/326.md b/changelog.d/326.md
new file mode 100644
index 000000000..a2822a6a8
--- /dev/null
+++ b/changelog.d/326.md
@@ -0,0 +1 @@
+- Cite SI 2016/909 reg. 2 on the benefit cap parameter, which is where the 2016-11-07 values originate.
diff --git a/policyengine_uk/parameters/gov/dwp/benefit_cap.yaml b/policyengine_uk/parameters/gov/dwp/benefit_cap.yaml
index dbee93083..2bf46a5a0 100644
--- a/policyengine_uk/parameters/gov/dwp/benefit_cap.yaml
+++ b/policyengine_uk/parameters/gov/dwp/benefit_cap.yaml
@@ -38,6 +38,8 @@ non_single:
       2024-04-01: 22_020
       2025-04-01: 22_020
 metadata:
-  reference: 
+  reference:
+    - title: The Benefit Cap (Housing Benefit and Universal Credit) (Amendment) Regulations 2016 reg. 2
+      href: https://www.legislation.gov.uk/uksi/2016/909/regulation/2/made
     - title: The Universal Credit Regulations 2013 reg. 80A
       href: https://www.legislation.gov.uk/uksi/2013/376/regulation/80A