diff --git a/spec/protocols/OVERVIEW.md b/spec/protocols/OVERVIEW.md
index 5bddb1bcb..e90af8781 100644
--- a/spec/protocols/OVERVIEW.md
+++ b/spec/protocols/OVERVIEW.md
@@ -10,26 +10,38 @@ This document describes the OpenSharing Protocol's general concepts, including t
 
 A profile file is a JSON file that contains the information for a recipient to access shared data on a OpenSharing server. There are a few fields in this file as listed below.
 
-Field Name | Descrption
--|-
-shareCredentialsVersion | The file format version of the profile file. This version will be increased whenever non-forward-compatible changes are made to the profile format. When a client is running an unsupported profile file format version, it should show an error message instructing the user to upgrade to a newer version of their client.
-endpoint | The url of the sharing server.
-icebergEndpoint | The url of the sharing server that supports the iceberg table endpoints.
-bearerToken | The [bearer token](https://tools.ietf.org/html/rfc6750) to access the server.
-expirationTime | The expiration time of the bearer token in [ISO 8601 format](https://www.w3.org/TR/NOTE-datetime). This field is optional and if it is not provided, the bearer token can be seen as never expire.
+| Field Name              | Description                                                                                                                                                                                                                                                                                                                  | Note       |
+| ----------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------- |
+| shareCredentialsVersion | The file format version of the profile file. This version will be increased whenever non-forward-compatible changes are made to the profile format. When a client is running an unsupported profile file format version, it should show an error message instructing the user to upgrade to a newer version of their client. | [required] |
+| endpoint                | The url of the sharing server.                                                                                                                                                                                                                                                                                               | [required] |
+| icebergEndpoint         | The url of the sharing server's Iceberg REST catalog endpoint. If provided, it must be `{endpoint}/iceberg`.                                                                                                                                                                                                                 | [optional] |
+| bearerToken             | The [bearer token](https://tools.ietf.org/html/rfc6750) to access the server.                                                                                                                                                                                                                                                | [required] |
+| expirationTime          | The expiration time of the bearer token in [ISO 8601 format](https://www.w3.org/TR/NOTE-datetime). This field is optional and if it is not provided, the bearer token can be seen as never expire.                                                                                                                           | [optional] |
 
 Example:
 
 ```json
 {
   "shareCredentialsVersion": 1,
-  "endpoint": "https://sharing.opensharing.io/open-sharing/",
-  "icebergEndpoint": "https://sharing.opensharing.io/open-sharing/iceberg/",
+  "endpoint": "https://sharing.opensharing.io/open-sharing",
+  "icebergEndpoint": "https://sharing.opensharing.io/open-sharing/iceberg",
   "bearerToken": "<token>",
   "expirationTime": "2021-11-12T00:12:29.0Z"
 }
 ```
 
+or
+
+```json
+{
+  "shareCredentialsVersion": 1,
+  "endpoint": "https://sharing.opensharing.io/open-sharing",
+  "bearerToken": "<token>"
+}
+```
+
+OpenSharing servers that share tables in Iceberg format may optionally provide an `icebergEndpoint` in the profile file. If provided, it must be `{endpoint}/iceberg`. Clients must not assume `icebergEndpoint` is present and should handle its absence gracefully.
+
 ## Names
 
 Share, Schema, and shared objects are identifiable by names. To ensure compatibility and avoid issues across different sharing servers, the following limitations apply for object names: