[4.1] a8cd0c8 Update changelog: Separate stack for signals

[PÃ¥l Hermunn Johansen]

commit a8cd0c8cccf5940950b06b84be1720719c365651
Author: Pål Hermunn Johansen <hermunn at varnish-software.com>
Date:   Thu Sep 28 09:50:34 2017 +0200

    Update changelog: Separate stack for signals

diff --git a/doc/changes.rst b/doc/changes.rst
index ae32686..558be47 100644
--- a/doc/changes.rst
+++ b/doc/changes.rst
@@ -7,9 +7,10 @@ Changes since 4.1.8:
 * Added ``bereq.is_bgfetch`` which is true for background fetches.
 * Add the vtc feature ignore_unknown_macro.
 * Expose to VCL whether or not a fetch is a background fetch (bgfetch)
-* Ignore req.ttl when keeping track of epired objects (see 2422_)
+* Ignore req.ttl when keeping track of expired objects (see 2422_)
 * Move the cli buffer to VSB (from stack). This deprecates the parameter
   cli_buffer.
+* Use a separate stack for signals.
 
 .. _2422: https://github.com/varnishcache/varnish-cache/pull/2422