Fix typo
diff --git a/Doc/library/socket.rst b/Doc/library/socket.rst
index 2de867d..3abd8cd 100644
--- a/Doc/library/socket.rst
+++ b/Doc/library/socket.rst
@@ -722,7 +722,7 @@
Set a timeout on blocking socket operations. The *value* argument can be a
nonnegative float expressing seconds, or ``None``. If a float is given,
- subsequent socket operations will raise an :exc:`timeout` exception if the
+ subsequent socket operations will raise a :exc:`timeout` exception if the
timeout period *value* has elapsed before the operation has completed. Setting
a timeout of ``None`` disables timeouts on socket operations.
``s.settimeout(0.0)`` is equivalent to ``s.setblocking(0)``;