diff --git a/doc/is_permutation.qbk b/doc/is_permutation.qbk
index 47d692c..267bfab 100644
--- a/doc/is_permutation.qbk
+++ b/doc/is_permutation.qbk
@@ -71,11 +71,11 @@ All of the variants of `is_permutation` take their parameters by value, and do n
 
 [heading Notes]
 
-* The three iterator versions of the routine `is_permutation` is part of the C++11 standard. When compiled using a C++11 implementation, the implementation from the standard library will be used.
+* The three iterator versions of the routine `is_permutation` are part of the C++11 standard. When compiled using a C++11 implementation, the implementation from the standard library will be used.
 
-* The four iterator versions of the routine `is_permutation` is part of the proposed C++14 standard. When C++14 standard libraries become available, the implementation should be changed to use the implementation from the standard library (if available).
+* The four iterator versions of the routine `is_permutation` are part of the proposed C++14 standard. When C++14 standard libraries become available, the implementation should be changed to use the implementation from the standard library (if available).
 
-* `is_permutation` returns true when passed a pair empty ranges, no matter what predicate is passed to test with. 
+* `is_permutation` returns true when passed a pair of empty ranges, no matter what predicate is passed to test with. 
 
 [endsect]