From: Richard M. Stallman <rms@gnu.org>
Date: Tue, 30 Sep 2003 12:59:20 +0000 (+0000)
Subject: (Overlay Properties): Clarify `evaporate' property.
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(Overlay Properties): Clarify `evaporate' property.
---

diff --git a/lispref/display.texi b/lispref/display.texi
index fb71744f3e7..391d3f4764e 100644
--- a/lispref/display.texi
+++ b/lispref/display.texi
@@ -1129,7 +1129,9 @@ sense---only on the screen.
 @item evaporate
 @kindex evaporate @r{(overlay property)}
 If this property is non-@code{nil}, the overlay is deleted automatically
-if it ever becomes empty (i.e., if it spans no characters).
+if it becomes empty (i.e., if its length becomes zero).  However,
+if the overlay is @emph{already} empty, @code{evaporate} does not
+delete it.
 
 @item local-map
 @cindex keymap of character (and overlays)