#9911: doc copyedits.
diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 57a916c..30529f1 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -429,7 +429,7 @@
 
    Set the current process's real, effective, and saved user ids.
 
-   Availibility: Unix.
+   Availability: Unix.
 
    .. versionadded:: 3.2