diff --git a/lib/client.js b/lib/client.js
index 89fd40d1..dc596f6f 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -1169,6 +1169,14 @@ class Client extends EventEmitter {
     this._transport.send(buffer.buffer, buffer.offset, receiver);
   }
 
+  /**
+   * Send an errorResponse for a confirmedService.
+   * @param {string} receiver ip address of the service initiator
+   * @param {enum.ConfirmedServices} service the initiated service the generated the error.
+   * @param {number} invokeId  the 'invoke-id' from the confirmed service request to which the error is a response.
+   * @param {enum.ErrorClasses} errorClass
+   * @param {enum.ErrorCode} errorCode
+   */
   errorResponse(receiver, service, invokeId, errorClass, errorCode) {
     const buffer = this._getBuffer();
     baNpdu.encode(buffer, baEnum.NpduControlPriority.NORMAL_MESSAGE, receiver);