diff --git a/Makefile b/Makefile
index 646c68e..522bb42 100644
--- a/Makefile
+++ b/Makefile
@@ -90,9 +90,9 @@ mypy: $(venv)
 build: $(venv)
 	$(python) -m build
 
-.PHONY: doc  ## Build documentation
-doc: $(venv)
-	$(python) -m sphinx -b html -a docs $(DOCS_BUILDDIR)
+.PHONY: docs  ## Build documentation
+docs: $(venv)
+	$(python) -m sphinx -W -n -b html -a docs $(DOCS_BUILDDIR)
 
 .PHONY: serve  ## Serve documentation at http://127.0.0.1:8000
 serve: $(venv)
diff --git a/docs/conf.py b/docs/conf.py
index 3da42be..9804bc1 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -3,6 +3,7 @@
 Documentation:
     https://www.sphinx-doc.org/en/master/usage/configuration.html
 """
+
 import importlib.metadata
 import sys
 from pathlib import Path
diff --git a/docs/reference.rst b/docs/reference.rst
index 6b4fbcc..b8c32bf 100644
--- a/docs/reference.rst
+++ b/docs/reference.rst
@@ -107,6 +107,7 @@ Exceptions
 .. autoexception:: pyforce.AuthenticationError
 .. autoexception:: pyforce.ConnectionExpiredError
 .. autoexception:: pyforce.CommandExecutionError
+.. autoexception:: pyforce.ChangeUnknownError
 
 Other
 -----
@@ -119,3 +120,15 @@ Other
 
 .. autoenum:: pyforce.MarshalCode
    :members:
+
+.. autoenum:: pyforce.MessageLevel
+   :members:
+
+.. class:: pyforce.utils.PerforceDateTime
+
+   Alias of `datetime.datetime`
+
+.. class:: pyforce.utils.PerforceTimestamp
+
+   Alias of `datetime.datetime`
+
diff --git a/pyproject.toml b/pyproject.toml
index 50764a2..53113c5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ Changelog = "https://github.com/tahv/pyforce/blob/main/CHANGELOG.md"
 tests = ["pytest", "coverage"]
 style = ["ruff"]
 mypy = ["mypy", "pytest"]
-doc = [
+docs = [
   "sphinx",
   "sphinx-autobuild",
   "furo",
@@ -42,7 +42,7 @@ doc = [
   "autodoc_pydantic",
   "enum_tools[sphinx]",
 ]
-dev = ["pyforce-p4[tests,style,mypy,doc]"]
+dev = ["pyforce-p4[tests,style,mypy,docs]"]
 
 [tool.hatch.version]
 source = "vcs"
diff --git a/src/pyforce/models.py b/src/pyforce/models.py
index 357a77a..21ba6e3 100644
--- a/src/pyforce/models.py
+++ b/src/pyforce/models.py
@@ -2,9 +2,9 @@
 
 from __future__ import annotations
 
+import pathlib
 import shlex
 from dataclasses import dataclass
-from pathlib import Path  # noqa: TCH003
 from typing import Any, Iterable, List, Literal, Mapping, NamedTuple, Union, cast
 
 from pydantic import (
@@ -186,7 +186,7 @@ class Client(PyforceModel):
     owner: str = Field(alias="Owner")
     """The name of the user who owns the workspace."""
 
-    root: Path = Field(alias="Root")
+    root: pathlib.Path = Field(alias="Root")
     """Workspace root directory on the local host
 
     All the file in `views` are relative to this directory.
diff --git a/src/pyforce/utils.py b/src/pyforce/utils.py
index 6419ea2..2f9a432 100644
--- a/src/pyforce/utils.py
+++ b/src/pyforce/utils.py
@@ -25,6 +25,7 @@ class StrEnum(str, Enum):
     "Connection",
     "MessageSeverity",
     "MarshalCode",
+    "MessageLevel",
 ]
 
 log: Final = logging.getLogger("pyforce")