diff --git a/code/API_definitions/session-insights.yaml b/code/API_definitions/session-insights.yaml
index 09a6da7..bc047ab 100644
--- a/code/API_definitions/session-insights.yaml
+++ b/code/API_definitions/session-insights.yaml
@@ -295,18 +295,20 @@ components:
       in: header
       description: Correlation id for the different services
       schema:
-        type: string
-        pattern: ^[a-zA-Z0-9-_:;.\/<>{}]{0,256}$
-        example: "b4333c46-49c0-4f62-80d7-f0ef930f1c46"
+        $ref: "#/components/schemas/XCorrelator"
 
   headers:
     x-correlator:
       description: Correlation id for the different services
       schema:
-        type: string
-        pattern: ^[a-zA-Z0-9-_:;.\/<>{}]{0,256}$
+        $ref: "#/components/schemas/XCorrelator"
 
   schemas:
+    XCorrelator:
+      type: string
+      pattern: ^[a-zA-Z0-9-_:;.\/<>{}]{0,256}$
+      example: "b4333c46-49c0-4f62-80d7-f0ef930f1c46"
+
     SessionId:
       description: Session ID in UUID format
       type: string