diff --git a/README.md b/README.md
index 29de893..9b1a405 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,7 @@ Please reach out at info@cambioml.com for an API key.
 📜 Examples
 
 ```python
+import os
 import sec_agent_sdk
 from sec_agent_sdk import FormType, FilingTable
 from sec_agent_sdk.rest import ApiException
@@ -36,7 +37,7 @@ from pprint import pprint
 configuration = sec_agent_sdk.Configuration()
 
 # Configure API key authorization: APIKeyHeader
-configuration.api_key['APIKeyHeader'] = 'YOUR_API_KEY'
+configuration.api_key['APIKeyHeader'] = os.environ["API_KEY"]
 
 # Enter a context with an instance of the API client
 with sec_agent_sdk.ApiClient(configuration) as api_client:
diff --git a/sec_agent_sdk/api/default_api.py b/sec_agent_sdk/api/default_api.py
index 006e90f..38ada8e 100644
--- a/sec_agent_sdk/api/default_api.py
+++ b/sec_agent_sdk/api/default_api.py
@@ -44,8 +44,8 @@ def search_sec_filing(
         self,
         form_type: FormType,
         company: StrictStr,
-        date_filed: StrictStr,
         table: FilingTable,
+        date_filed: Optional[StrictStr] = None,
         _request_timeout: Union[
             None,
             Annotated[StrictFloat, Field(gt=0)],
@@ -126,8 +126,8 @@ def search_sec_filing_with_http_info(
         self,
         form_type: FormType,
         company: StrictStr,
-        date_filed: StrictStr,
         table: FilingTable,
+        date_filed: Optional[StrictStr] = None,
         _request_timeout: Union[
             None,
             Annotated[StrictFloat, Field(gt=0)],