diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst
index 3a57cd9..0b79072 100644
--- a/Doc/library/itertools.rst
+++ b/Doc/library/itertools.rst
@@ -216,7 +216,7 @@
 
    Make an iterator that filters elements from *data* returning only those that
    have a corresponding element in *selectors* that evaluates to ``True``.
-   Stops when either the *data* or *selectors* iterables have been exhausted.
+   Stops when either the *data* or *selectors* iterables has been exhausted.
    Equivalent to::
 
        def compress(data, selectors):