**API Keys**
-You can specify ``Bugzilla_api_key`` or simply ``api_key`` as an argument to
-any call, and you will be logged in as that user if the key is correct and has
-not been revoked. You can set up an API key by using the :ref:`API Keys tab <api-keys>` in the
+You can specify 'X-BUGZILLA-API-KEY' header with the API key as a value to
+any request, and you will be authenticated as that user if the key is correct and has not been revoked.
+
+You can set up an API key by using the :ref:`API Keys tab <api-keys>` in the
Preferences pages.
API keys may also be requested via :ref:`Authentication Delegation <auth-delegation>`.
+**WARNING**: It should be noted that additional authentication methods exist, but they are **not recommended** for use and are likely to be deprecated in future versions of BMO, due to security concerns. These additional methods include the following:
+
+ - username and password via ``Bugzilla_login`` and ``Bugzilla_password`` or simply ``login`` and ``password`` respectively in query parameters.
+ - username and password via ``X-BUGZILLA-LOGIN`` and ``X-BUGZILLA-PASSWORD`` headers respectively.
+ - api key via ``Bugzilla_api_key`` or simply ``api_key`` in query parameters.
+
Useful Parameters
-----------------