diff --git a/.gitignore b/.gitignore
index c61cfec..8d56382 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .coverage
 tests/__pycache__/
 veryfi/__pycache__/
+.idea/*
diff --git a/NEWS.md b/NEWS.md
index 077abda..cfc09e6 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,8 @@
 CHANGES
 =======
+3.2.0
+-----
+* Add support to add tags on existing documents
 
 3.1.1
 -----
diff --git a/README.md b/README.md
index 3bf35db..0024bc9 100755
--- a/README.md
+++ b/README.md
@@ -152,6 +152,8 @@ veryfi_client.update_document(id=12345, vendor=new_vendor, category=new_category
 
 
 ## Need help?
+Visit https://docs.veryfi.com/ to access integration guides and usage notes in the Veryfi API Documentation Portal
+
 If you run into any issue or need help installing or using the library, please contact support@veryfi.com.
 
 If you found a bug in this library or would like new features added, then open an issue or pull requests against this repo!
diff --git a/tests/test_client.py b/tests/test_client.py
index 62c8c55..8c95e8f 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -367,3 +367,17 @@ def test_get_documents():
         **{"created_lt": "2021-07-22+00:00:00"},
     )
     assert d == mock
+
+
+@responses.activate
+def test_tags():
+    mock_doc_id = 169985445
+    mock_resp = {"id": 6673474, "name": "tag_123"}
+    client = Client(client_id="v", client_secret="w", username="o", api_key="c")
+    responses.put(
+        f"{client.versioned_url}/partner/documents/{mock_doc_id}/tags/",
+        json=mock_resp,
+        status=200,
+    )
+    d = client.add_tag(mock_doc_id, "tag_123")
+    assert d == mock_resp
diff --git a/veryfi/client.py b/veryfi/client.py
index 760a575..f24ae8c 100644
--- a/veryfi/client.py
+++ b/veryfi/client.py
@@ -61,7 +61,7 @@ def _get_headers(self) -> Dict:
         :return: Dictionary with headers
         """
         final_headers = {
-            "User-Agent": "Python Veryfi-Python/3.0.0",
+            "User-Agent": "Python Veryfi-Python/3.2.0",
             "Accept": "application/json",
             "Content-Type": "application/json",
             "Client-Id": self.client_id,
@@ -387,3 +387,14 @@ def delete_line_item(self, document_id, line_item_id):
         endpoint_name = f"/documents/{document_id}/line-items/{line_item_id}"
         request_arguments = {}
         self._request("DELETE", endpoint_name, request_arguments)
+
+    def add_tag(self, document_id, tag_name):
+        """
+        Add a new tag on an existing document.
+        :param document_id: ID of the document you'd like to update
+        :param tag_name: name of the new tag
+        :return: Added tag data
+        """
+        endpoint_name = f"/documents/{document_id}/tags/"
+        request_arguments = {"name": tag_name}
+        return self._request("PUT", endpoint_name, request_arguments)