#5601: clarify that webbrowser is not meant for file names.
diff --git a/Doc/library/webbrowser.rst b/Doc/library/webbrowser.rst
index 4250598..af8b637 100644
--- a/Doc/library/webbrowser.rst
+++ b/Doc/library/webbrowser.rst
@@ -55,6 +55,10 @@
under many window managers this will occur regardless of the setting of this
variable).
+ Note that on some platforms, trying to open a filename using this function,
+ may work and start the operating system's associated program. However, this
+ is neither supported nor portable.
+
.. versionchanged:: 2.5
*new* can now be 2.