diff --git a/docs/source/capi/index.rst b/docs/source/capi/index.rst
new file mode 100644
index 000000000..f3cdbb840
--- /dev/null
+++ b/docs/source/capi/index.rst
@@ -0,0 +1,34 @@
+.. _capi:
+
+=====
+C API
+=====
+
+.. c:function:: int openmc_find(double* xyz, int rtype)
+
+   Return the ID of the cell/material containing a given point
+
+   :param xyz: Cartesian coordinates
+   :type xyz: double[3]
+   :param rtype: Which ID to return (1=cell, 2=material)
+   :type rtype: int
+   :rtype: int
+
+.. c:function:: void openmc_init(int intracomm)
+
+   Initialize OpenMC
+
+   :param intracomm: MPI intracommunicator
+   :type intracomm: int
+
+.. c:function:: void openmc_finalize()
+
+   Finalize a simulation
+
+.. c:function:: void openmc_reset()
+
+   Resets all tally scores
+
+.. c:function:: void openmc_run()
+
+   Run a simulation
diff --git a/docs/source/conf.py b/docs/source/conf.py
index c3434914b..95930fedb 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -25,8 +25,9 @@ except ImportError:
 
 
 MOCK_MODULES = ['numpy', 'numpy.polynomial', 'numpy.polynomial.polynomial',
-                'h5py', 'pandas', 'uncertainties', 'openmoc',
-                'openmc.data.reconstruct']
+                'numpy.ctypeslib', 'scipy', 'scipy.sparse', 'scipy.interpolate',
+                'scipy.integrate', 'scipy.optimize', 'scipy.special', 'h5py',
+                'pandas', 'uncertainties', 'openmoc', 'openmc.data.reconstruct']
 sys.modules.update((mod_name, MagicMock()) for mod_name in MOCK_MODULES)
 
 import numpy as np
diff --git a/docs/source/index.rst b/docs/source/index.rst
index ce4a5f6f8..00b09db9e 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -36,6 +36,7 @@ free to send a message to the User's Group `mailing list`_.
     usersguide/index
     devguide/index
     pythonapi/index
+    capi/index
     io_formats/index
     publications
     license