diff --git a/docs/reference/glib/programming.xml b/docs/reference/glib/programming.xml
index 52df907e8..e4cda4cec 100644
--- a/docs/reference/glib/programming.xml
+++ b/docs/reference/glib/programming.xml
@@ -34,9 +34,16 @@ GLib creates a worker thread for its own purposes so GLib applications
 will always have at least 2 threads.
 </para>
 
+<para>
+In particular, this means that programs must only use
+<ulink url="man:signal-safety(7)">async-signal-safe functions</ulink> between
+calling <function>fork()</function> and <function>exec()</function>, even if
+they haven’t explicitly spawned another thread yet.
+</para>
+
 <para>
 See the sections on <link linkend="glib-Threads">threads</link> and
-<link linkend="glib-Thread-Pools">threadpools</link> for GLib APIs that
+<link linkend="glib-Thread-Pools">thread pools</link> for GLib APIs that
 support multithreaded applications.
 </para>