From 93597752f27d3b4e0255b911fe6e8423ceb54957 Mon Sep 17 00:00:00 2001
From: Adam Nelson <nelsonag@umich.edu>
Date: Wed, 9 Nov 2016 18:19:13 -0500
Subject: [PATCH] Resolved @paulromano comments

---
 openmc/data/function.py | 9 ++++++---
 openmc/data/library.py  | 9 ++++-----
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/openmc/data/function.py b/openmc/data/function.py
index c8fa15b768..0515a57c0c 100644
--- a/openmc/data/function.py
+++ b/openmc/data/function.py
@@ -407,7 +407,7 @@ class Combination(EqualityMixin):
     Parameters
     ----------
     functions : Iterable of Callable
-        Functions which are to be added together
+        Functions to combine according to operations
     operations : Iterable of numpy.ufunc
         Operations to perform between functions; note that the standard order
         of operations will not be followed, but can be simulated by
@@ -418,9 +418,12 @@ class Combination(EqualityMixin):
     Attributes
     ----------
     functions : Iterable of Callable
-        Functions which are to be added together
+        Functions to combine according to operations
     operations : Iterable of numpy.ufunc
-        Operations to perform between functions
+        Operations to perform between functions; note that the standard order
+        of operations will not be followed, but can be simulated by
+        combinations of Combination objects. The operations parameter must have
+        a length one less than the number of functions.
 
     """
 
diff --git a/openmc/data/library.py b/openmc/data/library.py
index 0363de4fc5..9f6d931467 100644
--- a/openmc/data/library.py
+++ b/openmc/data/library.py
@@ -22,13 +22,12 @@ class DataLibrary(EqualityMixin):
     def __init__(self):
         self.libraries = []
 
-    def get_by_materials(self, value):
-        """Access a library entry by passing a value of the 'materials'
-        attribute of the library entry.
+    def get_by_material(self, value):
+        """Return the library dictionary containing a given material.
 
         Returns
         -------
-        library : dict
+        library : dict or None
             Dictionary summarizing cross section data from a single file;
             the dictionary has keys 'path', 'type', and 'materials'.
 
@@ -107,7 +106,7 @@ class DataLibrary(EqualityMixin):
         Returns
         -------
         data : openmc.data.DataLibrary
-            openmc.data.DataLibrary object initialized from the provided XML
+            Data library object initialized from the provided XML
 
         """