diff --git a/docs/source/usersguide/install.rst b/docs/source/usersguide/install.rst
index 24bcc7164..b0618818e 100644
--- a/docs/source/usersguide/install.rst
+++ b/docs/source/usersguide/install.rst
@@ -148,8 +148,8 @@ Prerequisites
       .. important::
 
           If you are building HDF5 version 1.8.x or earlier, you must include
-          ``--enable-fortran2003`` when configuring HDF5 or else OpenMC will not
-          be able to compile.
+          ``--enable-fortran2003`` as well when configuring HDF5 or else OpenMC 
+          will not be able to compile.
 
 .. admonition:: Optional
    :class: note
@@ -416,7 +416,9 @@ Prerequisites
 The Python API works with Python 3.4+. In addition to Python itself, the API
 relies on a number of third-party packages. All prerequisites can be installed
 using Conda_ (recommended), pip_, or through the package manager in most Linux
-distributions.
+distributions. To run simulations in parallel using MPI, it is recommended to
+build mpi4py, HDF5, h5py from source, in that order, using the same compilers
+as for OpenMC.
 
 .. admonition:: Required
    :class: error