diff --git a/README.md b/README.md
index 5ecfc99..8b86bf6 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,10 @@ Python v3.13 or greater.
 ```python
 from crowdstrike_aidr import AIGuard
 
-client = AIGuard(base_url_template="https://api.crowdstrike.com/aidr/{SERVICE_NAME}")
+client = AIGuard(
+  base_url_template="https://api.crowdstrike.com/aidr/{SERVICE_NAME}",
+  token="my API token"
+)
 
 response = client.guard_chat_completions(
     guard_input={
@@ -46,13 +49,15 @@ from crowdstrike_aidr import AIGuard
 # Using a float (total timeout in seconds).
 client = AIGuard(
     base_url_template="https://api.crowdstrike.com/aidr/{SERVICE_NAME}",
-    timeout=30.0
+    token="my API token",
+    timeout=30.0,
 )
 
 # Using httpx.Timeout for more granular control.
 client = AIGuard(
     base_url_template="https://api.crowdstrike.com/aidr/{SERVICE_NAME}",
-    timeout=httpx.Timeout(timeout=60.0, connect=10.0)
+    token="my API token",
+    timeout=httpx.Timeout(timeout=60.0, connect=10.0),
 )
 ```
 
@@ -77,17 +82,14 @@ response = client.guard_chat_completions(
 ## Retries
 
 The SDK automatically retries failed requests with exponential backoff. By
-default, the client will retry up to 2 times.
-
-### Client-level retries
-
-Set the maximum number of retries for all requests:
+default, the client will retry up to 2 times. Set `max_retries` during client
+creation to change this.
 
 ```python
 from crowdstrike_aidr import AIGuard
 
 client = AIGuard(
     base_url_template="https://api.crowdstrike.com/aidr/{SERVICE_NAME}",
-    max_retries=5  # Retry up to 5 times
+    max_retries=5  # Retry up to 5 times.
 )
 ```
diff --git a/src/crowdstrike_aidr/_client.py b/src/crowdstrike_aidr/_client.py
index 7f43780..ff35899 100644
--- a/src/crowdstrike_aidr/_client.py
+++ b/src/crowdstrike_aidr/_client.py
@@ -5,7 +5,7 @@
 import time
 from collections.abc import Mapping
 from random import random
-from typing import TYPE_CHECKING, Any, cast, get_origin
+from typing import TYPE_CHECKING, Any, cast, get_origin, override
 
 import httpx
 from httpx import URL, Timeout
@@ -237,11 +237,13 @@ def __del__(self) -> None:
 
 class SyncAPIClient(BaseClient[httpx.Client]):
     _client: httpx.Client
+    _token: str
 
     def __init__(
         self,
         *,
         base_url_template: str,
+        token: str,
         max_retries: int = DEFAULT_MAX_RETRIES,
         timeout: float | Timeout = DEFAULT_TIMEOUT,
         http_client: httpx.Client | None = None,
@@ -260,9 +262,17 @@ def __init__(
             custom_headers=custom_headers,
             custom_query=custom_query,
         )
+
+        self._token = token
+
         resolved_base_url = self.base_url
         self._client = http_client or SyncHttpxClientWrapper(base_url=resolved_base_url, timeout=self.timeout)
 
+    @property
+    @override
+    def auth_headers(self) -> dict[str, str]:
+        return {"Authorization": f"Bearer {self._token}"}
+
     def _post(
         self,
         path: str,
diff --git a/tests/test_ai_guard.py b/tests/test_ai_guard.py
index 2c8e4e0..de6b0a6 100644
--- a/tests/test_ai_guard.py
+++ b/tests/test_ai_guard.py
@@ -15,7 +15,7 @@
 
 @pytest.fixture(scope="session")
 def client(request: pytest.FixtureRequest) -> Iterator[AIGuard]:
-    yield AIGuard(base_url_template=base_url_template)
+    yield AIGuard(base_url_template=base_url_template, token="my API token")
 
 
 def test_guard_chat_completions(client: AIGuard) -> None: