diff --git a/compiler.rst b/compiler.rst
--- a/compiler.rst
+++ b/compiler.rst
@@ -175,7 +175,7 @@
 PyArena_New() will create a new arena.  The returned PyArena structure will
 store pointers to all memory given to it.  This does the bookkeeping of what
 memory needs to be freed when the compiler is finished with the memory it used.
-That freeing is done with PyArena_Free().  This needs to only be called in
+That freeing is done with PyArena_Free().  This only needs to be called in
 strategic areas where the compiler exits.
 
 As stated above, in general you should not have to worry about memory