--- a/xml/en/docs/http/ngx_http_upstream_module.xml
+++ b/xml/en/docs/http/ngx_http_upstream_module.xml
@@ -10,7 +10,7 @@
 <module name="Module ngx_http_upstream_module"
         link="/en/docs/http/ngx_http_upstream_module.html"
         lang="en"
-        rev="90">
+        rev="91">
 
 <section id="summary">
 
@@ -574,6 +574,12 @@ are separated by commas and colons like 
 <link id="var_upstream_addr">$upstream_addr</link> variable.
 </tag-desc>
 
+<tag-name id="var_upstream_cache_age"><var>$upstream_cache_age</var>
+</tag-name>
+<tag-desc>
+age of the cache item (1.27.3).
+</tag-desc>
+
 <tag-name id="var_upstream_cache_key"><var>$upstream_cache_key</var>
 </tag-name>
 <tag-desc>