diff --git a/api-reference/doc-tool/doc-tool.yaml b/api-reference/doc-tool/doc-tool.yaml
index 8136ebae..2682707e 100644
--- a/api-reference/doc-tool/doc-tool.yaml
+++ b/api-reference/doc-tool/doc-tool.yaml
@@ -2054,6 +2054,9 @@ paths:
                     mode:
                       type: string
                       enum: [ INCLINIC, PHONE, VIDEO ]
+                    channel:
+                      type: string
+                      enum: [ Doctor, Walkin, Staff, Online-Appointment ]
                     start_time:
                       type: integer
                       description: 'Start time of the appointment in epoch'