diff --git a/docs/hazmat/backends/interfaces.rst b/docs/hazmat/backends/interfaces.rst
index 42dba72..f8341d1 100644
--- a/docs/hazmat/backends/interfaces.rst
+++ b/docs/hazmat/backends/interfaces.rst
@@ -588,7 +588,7 @@
 
         :param bytes data: PEM data to load.
         :param bytes password: The password to use if the data is encrypted.
-            Should be ``None`` is the data is not encrypted.
+            Should be ``None`` if the data is not encrypted.
         :return: A new instance of the appropriate type of private key that the
             serialized data contains.
         :raises ValueError: If the data could not be deserialized.