diff --git a/docs/source/quickinstall.rst b/docs/source/quickinstall.rst
index ac1ed52d62..58bdfaf404 100644
--- a/docs/source/quickinstall.rst
+++ b/docs/source/quickinstall.rst
@@ -18,11 +18,13 @@ and libraries may be needed. These include:
 - A Fortran compiler such as gfortran_
 - git_ version control software for obtaining source code (*optional*)
 - An MPI implementation for parallel runs (*optional*)
-- HDF5_ Library for improved output format (*optional*)
+- HDF5_ Library for portable binary output format (*optional*)
+- PETSc_ for CMFD acceleration (*optional*)
 
 .. _gfortran: http://gcc.gnu.org/wiki/GFortran
 .. _git: http://git-scm.com
 .. _HDF5: http://www.hdfgroup.org/HDF5/
+.. _PETSc: http://www.mcs.anl.gov/petsc/
 
 --------------------
 Obtaining the Source
diff --git a/docs/source/usersguide/install.rst b/docs/source/usersguide/install.rst
index 337868e943..aea509ad3e 100644
--- a/docs/source/usersguide/install.rst
+++ b/docs/source/usersguide/install.rst
@@ -32,10 +32,15 @@ To compile with support for HDF5_ output (highly recommended), you will need to
 have HDF5 installed on your computer. The installed version will need to have
 been compiled with the same compiler you intend to compile OpenMC with.
 
+To enable CMFD acceleration, you will need to have PETSc_ installed on your
+computer. The installed version will need to have been compiled with the same
+compiler you intend to compile OpenMC with.
+
 .. _gfortran: http://gcc.gnu.org/wiki/GFortran
 .. _OpenMPI: http://www.open-mpi.org
 .. _MPICH2: http://www.mcs.anl.gov/mpi/mpich/
 .. _HDF5: http://www.hdfgroup.org/HDF5/
+.. _PETSc: http://www.mcs.anl.gov/petsc/
 
 --------------------
 Obtaining the Source