diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index bb5f3b76c1e..1f62146c1cf 100644
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -184,7 +184,11 @@ This could happen if the version of WebKitGTK installed on your system
 is buggy, and errors out trying to start a subprocess through
 Bubblewrap sandboxing.  You can avoid the crash by setting the
 environment variables SNAP, SNAP_NAME and SNAP_REVISION, which will
-make WebKit use GLib to launch subprocesses instead.
+make WebKit use GLib to launch subprocesses instead.  For example,
+invoke Emacs like this (where "..." stands for the command-line
+arguments you need to pass to Emacs):
+
+  $ SNAP=1 SNAP_NAME=1 SNAP_REVISION=1 emacs ...
 
 ** Emacs crashes when you try to view a file with complex characters.