Remove trailing whitespace.
diff --git a/Doc/c-api/set.rst b/Doc/c-api/set.rst
index c6b097d..a60ccd6 100644
--- a/Doc/c-api/set.rst
+++ b/Doc/c-api/set.rst
@@ -101,7 +101,7 @@
.. versionchanged:: 2.6
Now guaranteed to return a brand-new :class:`frozenset`. Formerly,
- frozensets of zero-length were a singleton. This got in the way of
+ frozensets of zero-length were a singleton. This got in the way of
building-up new frozensets with :meth:`PySet_Add`.
The following functions and macros are available for instances of :class:`set`