diff --git a/CHANGES.rst b/CHANGES.rst
index c6818df4..e51fbfa9 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -3,9 +3,11 @@ pywb 2.3.4 changelist
 
 * Improvements to auto-fetch to support page fetch (webrecroder/wombat#5, #497)
   - Support fetching page with ``X-Wombat-History-Page`` and title ``X-Wombat-History-Title`` headers present.
-  - Attempt to extract title and pass along with cdx to ``_add_history_page()`` callback in RewriterApp, to indicate a url is a page.
+  - Attempt to extract title and pass along with cdx to ``_add_history_page()`` callback in RewriterApp, to indicate a url is a page. (#498)
   - General auto-fetch fixes: queue messages if worker not yet inited (in proxy mode), only parse <link> stylesheet hrefs as sheets.
 
+* Cookie Rewriting Fix: don't update cookie cache on service worker (``sw_`` modifier) responses (#499)
+
 
 pywb 2.3.3 changelist
 ~~~~~~~~~~~~~~~~~~~~~
diff --git a/pywb/apps/rewriterapp.py b/pywb/apps/rewriterapp.py
index dc0ff90a..68a64df3 100644
--- a/pywb/apps/rewriterapp.py
+++ b/pywb/apps/rewriterapp.py
@@ -383,9 +383,9 @@ class RewriterApp(object):
 
         cookie_rewriter = None
         if self.cookie_tracker and cookie_key:
-            # skip add cookie if service worker is not 200 -- sw will not be loaded by browser
-            # so don't update any cookies for it
-            if wb_url.mod == 'sw_' and record.http_headers.get_statuscode() != '200':
+            # skip add cookie if service worker is not 200
+            # it seems cookie headers from service workers are not applied, so don't update in cache
+            if wb_url.mod == 'sw_':
                 cookie_key = None
 
             cookie_rewriter = self.cookie_tracker.get_rewriter(urlrewriter,