Improve documentation of `ns-use-proxy-icon`

* doc/emacs/macos.texi (Mac / GNUstep Customization):
* src/nsfns.m (syms_of_nsfns): Fix documentation of
'ns-use-proxy-icon'; explain what it does and how it's
used.  (Bug#66190)

1 files changed, 6 insertions, 1 deletions

diff --git a/src/nsfns.m b/src/nsfns.m
index 5ae2cc77bb2..1aab5a3b508 100644
--- a/src/nsfns.m
+++ b/src/nsfns.m
@@ -3919,7 +3919,12 @@ be used as the image of the icon representing the frame.  */);
 
   DEFVAR_BOOL ("ns-use-proxy-icon", ns_use_proxy_icon,
                doc: /* When non-nil display a proxy icon in the titlebar.
-Default is t.  */);
+The proxy icon can be used to drag the file associated with the
+current buffer to other applications, much in the same way you would
+do it from Finder.  Note that you might have to disable
+`tool-bar-mode' to see the proxy icon.
+
+The default value is t.  */);
   ns_use_proxy_icon = true;
 
   DEFVAR_LISP ("x-max-tooltip-size", Vx_max_tooltip_size,