From f02fd8f3383280f25fc2190cf9ef4cbc261f671f Mon Sep 17 00:00:00 2001
From: Leif Andersen <leif@leifandersen.net>
Date: Fri, 5 Feb 2016 18:34:23 -0500
Subject: [PATCH] Add link to weak reference.

---
 gui-lib/framework/preferences.rkt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gui-lib/framework/preferences.rkt b/gui-lib/framework/preferences.rkt
index 3a612fda..5d50e3bc 100644
--- a/gui-lib/framework/preferences.rkt
+++ b/gui-lib/framework/preferences.rkt
@@ -406,7 +406,9 @@ the state transitions / contracts are:
     invoked, removes the callback from this preference.
     
     If @racket[weak?] is true, the preferences system will only hold on to
-    the callback weakly.
+    the callback
+    @tech[#:key "weak references"
+          #:doc '(lib "scribblings/reference/reference.scrbl")]{weakly}.
     
     The callbacks will be called in the order in which they were added.