diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 35a9f8cf3ad..2295ffc82f1 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -4389,7 +4389,7 @@ 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.