diff --git a/.gitignore b/.gitignore
index 1c38215d..d50693a3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,3 +25,6 @@ dist
 .reports
 /sandbox/*.log
 /sandbox-staging
+/specification/components/x-nhsd-apim/access.yml
+/specification/components/x-nhsd-apim/target.yml
+/specification/components/security/security.yml
diff --git a/specification/api/components/x-nhsd-apim/target-attributes.yml b/specification/api/components/x-nhsd-apim/target-attributes.yml
new file mode 100644
index 00000000..74d901d1
--- /dev/null
+++ b/specification/api/components/x-nhsd-apim/target-attributes.yml
@@ -0,0 +1,3 @@
+- name: NHSD-Supplier-ID
+  header: NHSD-Supplier-ID
+  required: false
diff --git a/specification/api/notify-supplier-phase1.yml b/specification/api/notify-supplier-phase1.yml
index 374c784c..1b59746d 100644
--- a/specification/api/notify-supplier-phase1.yml
+++ b/specification/api/notify-supplier-phase1.yml
@@ -79,3 +79,5 @@ x-nhsd-apim:
     $ref: ./components/x-nhsd-apim/access.yml
   target:
     $ref: ./components/x-nhsd-apim/target.yml
+  target-attributes:
+    $ref: ./components/x-nhsd-apim/target-attributes.yml