diff --git a/docs/hazmat/backends/interfaces.rst b/docs/hazmat/backends/interfaces.rst
index 546aa76..394d060 100644
--- a/docs/hazmat/backends/interfaces.rst
+++ b/docs/hazmat/backends/interfaces.rst
@@ -327,9 +327,12 @@
 
     A backend with methods for using CMAC
 
-    .. method:: cmac_supported()
+    .. method:: cmac_algorithm_supported(algorithm)
 
-        :return: True if CMAC is supported by the backend. False if otherwise.
+        :param algorithm: An instance of a
+            :class:`~cryptography.hazmat.primitives.interfaces.BlockCipherAlgorithm`
+            provider.
+        :return: Returns True if the block cipher is supported for CMAC by this backend
 
     .. method:: create_cmac_ctx(algorithm)