diff --git a/Help/command/set.rst b/Help/command/set.rst
index d04b88004..b24ebefeb 100644
--- a/Help/command/set.rst
+++ b/Help/command/set.rst
@@ -25,7 +25,9 @@ If the ``PARENT_SCOPE`` option is given the variable will be set in
 the scope above the current scope.  Each new directory or function
 creates a new scope.  This command will set the value of a variable
 into the parent directory or calling function (whichever is applicable
-to the case at hand).
+to the case at hand). The previous state of the variable's value stays the
+same in the current scope (e.g., if it was undefined before, it is still
+undefined and if it had a value, it is still that value).
 
 Set Cache Entry
 ^^^^^^^^^^^^^^^