diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 371d59e9c31a45..83c5ed0b275b54 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -4616,7 +4616,7 @@ operating system.
 
 .. function:: sched_setparam(pid, param)
 
-   Set a scheduling parameters for the process with PID *pid*. A *pid* of 0 means
+   Set the scheduling parameters for the process with PID *pid*. A *pid* of 0 means
    the calling process. *param* is a :class:`sched_param` instance.