scratch/memrep 74edd50 1/2: Add a helpful note

[Lars Ingebrigtsen]

branch: scratch/memrep
commit 74edd504eeb6fafee9bfb7e0fc79d49f0866cfd3
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Add a helpful note
---
 lisp/emacs-lisp/memory-report.el | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lisp/emacs-lisp/memory-report.el b/lisp/emacs-lisp/memory-report.el
index 10a9783..2ff94ed 100644
--- a/lisp/emacs-lisp/memory-report.el
+++ b/lisp/emacs-lisp/memory-report.el
@@ -132,7 +132,8 @@
              (push (cons symbol size) variables)))))
      obarray)
     (list
-     (cons "Memory Used By Global Variables"
+     (cons (propertize "Memory Used By Global Variables"
+                       'help-echo "Upper bound; mutually overlapping data from 
different variables are counted several times")
            (seq-reduce #'+ (mapcar #'cdr variables) 0))
      (with-temp-buffer
        (insert (propertize "Largest Variables\n\n" 'face 'bold))