diff --git a/src/drf_yasg/openapi.py b/src/drf_yasg/openapi.py
index 5aee816..7e7210a 100644
--- a/src/drf_yasg/openapi.py
+++ b/src/drf_yasg/openapi.py
@@ -437,7 +437,7 @@ class Schema(SwaggerDict):
super(Schema, self).__init__(**extra)
if required is True or required is False:
# common error
- raise AssertionError("the `requires` attribute of schema must be an "
+ raise AssertionError("the `required` attribute of schema must be an "
"array of required property names, not a boolean!")
assert type, "type is required!"
self.title = title
diff --git a/src/drf_yasg/templates/drf-yasg/redoc-alpha.html b/src/drf_yasg/templates/drf-yasg/redoc-alpha.html
deleted file mode 100644
index a89c275..0000000
--- a/src/drf_yasg/templates/drf-yasg/redoc-alpha.html
+++ /dev/null
@@ -1,18 +0,0 @@
-{% load static %}
-
-
-
- {{ title }}
-
-
-
-
-
-
-
-
-
-
-
-
-