diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index 70844d4d26b1cb..2ba70cbf7c6a44 100644
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -870,7 +870,7 @@ always available. Unless explicitly noted otherwise, all variables are read-only
 
 .. function:: getswitchinterval()
 
-   Return the interpreter's "thread switch interval"; see
+   Return the interpreter's "thread switch interval" in seconds; see
    :func:`setswitchinterval`.
 
    .. versionadded:: 3.2