diff --git a/Doc/library/logging.rst b/Doc/library/logging.rst
index b4185c3..b77fd36 100644
--- a/Doc/library/logging.rst
+++ b/Doc/library/logging.rst
@@ -814,7 +814,8 @@
    effect is to disable all logging calls of severity *lvl* and below, so that
    if you call it with a value of INFO, then all INFO and DEBUG events would be
    discarded, whereas those of severity WARNING and above would be processed
-   according to the logger's effective level.
+   according to the logger's effective level. To undo the effect of a call to
+   ``logging.disable(lvl)``, call ``logging.disable(logging.NOTSET)``.
 
 
 .. function:: addLevelName(lvl, levelName)