diff --git a/lib/api_local.ml b/lib/api_local.ml
index feec1ca..1067630 100644
--- a/lib/api_local.ml
+++ b/lib/api_local.ml
@@ -34,6 +34,7 @@ let default_files_res : Slack_t.file =
     groups = [];
     permalink = None;
     permalink_public = None;
+    url_private = None;
   }
 
 let default_files_upload_res : Slack_t.files_upload_res = { ok = true; file = default_files_res }
diff --git a/lib/slack.atd b/lib/slack.atd
index 3d47f25..fe449eb 100644
--- a/lib/slack.atd
+++ b/lib/slack.atd
@@ -144,6 +144,7 @@ type file <ocaml attr="deriving make"> = {
   ~groups <ocaml default="[]">: string list;
   ?permalink: string nullable;
   ?permalink_public: string nullable;
+  ?url_private: string nullable;
 }
 
 type files_upload_res = {
@@ -515,6 +516,7 @@ type message_event = {
   ts: string;
   ?bot_id: string option;
   ?thread_ts: string option;
+  ?files: file list nullable;
 }
 
 type link_shared_link = {
diff --git a/lib_test/slack_payloads.expected b/lib_test/slack_payloads.expected
index 058ae61..30e5b9f 100644
--- a/lib_test/slack_payloads.expected
+++ b/lib_test/slack_payloads.expected
@@ -908,7 +908,22 @@ failed to update views: "Both external_id and view_id not found"
     "channel": "C049XFXK286",
     "user": "U04A3C2LC6N",
     "text": "",
-    "ts": "1671595066.592719"
+    "ts": "1671595066.592719",
+    "files": [
+      {
+        "id": "F04FPJE4ES3",
+        "name": "-.txt",
+        "title": "Untitled",
+        "mimetype": "text/plain",
+        "filetype": "text",
+        "pretty_type": "Plain Text",
+        "user": "U04A3C2LC6N",
+        "size": 6458,
+        "permalink": "https://test-bot2-server.slack.com/files/SOME_FILE_URLtxt",
+        "permalink_public": "https://slack-files.com/SOME_FILE_URL",
+        "url_private": "https://files.slack.com/files-pri/SOME_FILE_URL/-.txt"
+      }
+    ]
   },
   "event_id": "Ev04G41LD735",
   "event_time": 1671595066