diff --git a/api/simplyrets-openapi.yaml b/api/simplyrets-openapi.yaml
index cca7544..96ebaab 100644
--- a/api/simplyrets-openapi.yaml
+++ b/api/simplyrets-openapi.yaml
@@ -1298,6 +1298,20 @@ components:
         type: array
         items:
           type: string
+    coListAgent:
+      required: false
+      in: query
+      name: coListAgent
+      description: |
+        Filter the listings returned by the CoListAgent (`.coAgent.id`) field.
+        Note, the CoListAgent ID is provided by the MLS.
+
+        The primary ListAgent is not included in this query parameter.
+      explode: true
+      schema:
+        type: array
+        items:
+          type: string
     salesAgent:
       required: false
       in: query
@@ -1307,7 +1321,6 @@ components:
 
         Agent ID is provided by your RETS vendor or MLS.
 
-
         The co-sales or co-buyer's agent is not included in this query
         parameter.
       explode: true