diff --git a/Dockerfile b/Dockerfile
index c29e1321c9..6466c76856 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,6 @@ ENV FC=/usr/bin/mpif90 CC=/usr/bin/mpicc CXX=/usr/bin/mpicxx \
     PATH=/opt/openmc/bin:/opt/NJOY2016/build:$PATH \
     LD_LIBRARY_PATH=/opt/openmc/lib:$LD_LIBRARY_PATH \
     OPENMC_CROSS_SECTIONS=/root/nndc_hdf5/cross_sections.xml \
-    OPENMC_MULTIPOLE_LIBRARY=/root/WMP_Library \
     OPENMC_ENDF_DATA=/root/endf-b-vii.1
 
 # Install dependencies from Debian package manager
@@ -36,4 +35,4 @@ RUN git clone https://github.com/openmc-dev/openmc.git /opt/openmc && \
     cd .. && pip install -e .[test]
 
 # Download cross sections (NNDC and WMP) and ENDF data needed by test suite
-RUN ./opt/openmc/tools/ci/download-xs.sh
\ No newline at end of file
+RUN ./opt/openmc/tools/ci/download-xs.sh
diff --git a/docs/source/io_formats/cross_sections.rst b/docs/source/io_formats/cross_sections.rst
index 956b3fa5d7..60f1d4f505 100644
--- a/docs/source/io_formats/cross_sections.rst
+++ b/docs/source/io_formats/cross_sections.rst
@@ -25,9 +25,10 @@ node. For example,
 ``<library>`` Element
 ---------------------
 
-The ``<library>`` element indicates where an HDF5 cross section file is located,
-whether it contains incident neutron or thermal scattering data, and what
-materials are listed within. It has the following attributes:
+The ``<library>`` element indicates where an HDF5 data file is located, whether
+it contains incident neutron, incident photon, thermal scattering, or windowed
+multipole data, and what materials are listed within. It has the following
+attributes:
 
   :materials:
 
@@ -48,4 +49,5 @@ materials are listed within. It has the following attributes:
     directory containing the ``cross_sections.xml`` file.
 
   :type:
-    The type of data contained in the file, either 'neutron' or 'thermal'.
+    The type of data contained in the file. Accepted values are 'neutron',
+    'thermal', 'photon', and 'wmp'.