grammar is hard

README.md

@@ -4,4 +4,4 @@ The recursive part of this problem is short -- happening only in the mergesort m
 
 The `split_array` method is not mandatory to use, but I think it makes the solution a little easier to read and follow by making the `mergesort` method read almost exactly like the psuedocode, hiding all the details of how it works in other methods.
 
-The hardest part of this problem is writing the combine method and dealing with all the cases that occur when combining two lists of sorted numbers. **This is part is iterative, not recursive.**
+The hardest part of this problem is writing the combine method and dealing with all the cases that occur when combining two lists of sorted numbers. **This part is iterative, not recursive.**