diff --git a/openmc/__init__.py b/openmc/__init__.py
index b355385580..53fbec3f22 100644
--- a/openmc/__init__.py
+++ b/openmc/__init__.py
@@ -1,5 +1,3 @@
-import warnings
-
 from openmc.arithmetic import *
 from openmc.cell import *
 from openmc.mesh import *
diff --git a/openmc/material.py b/openmc/material.py
index 92d992a6f6..357753fa91 100644
--- a/openmc/material.py
+++ b/openmc/material.py
@@ -980,7 +980,7 @@ class Materials(cv.CheckedList):
         :envvar:`OPENMC_CROSS_SECTIONS` environment variable will be used for
         continuous-energy calculations and
         :envvar:`OPENMC_MG_CROSS_SECTIONS` will be used for multi-group
-        calculations to find the path to the XML cross section file.
+        calculations to find the path to the HDF5 cross section file.
     multipole_library : str
         Indicates the path to a directory containing a windowed multipole
         cross section library. If it is not set, the