--- 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="89">
+        rev="90">
 
 <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_key"><var>$upstream_cache_key</var>
+</tag-name>
+<tag-desc>
+the cache key being used (1.27.1).
+</tag-desc>
+
 <tag-name id="var_upstream_cache_status"><var>$upstream_cache_status</var>
 </tag-name>
 <tag-desc>

--- a/xml/ru/docs/http/ngx_http_upstream_module.xml
+++ b/xml/ru/docs/http/ngx_http_upstream_module.xml
@@ -10,7 +10,7 @@
 <module name="Модуль ngx_http_upstream_module"
         link="/ru/docs/http/ngx_http_upstream_module.html"
         lang="ru"
-        rev="89">
+        rev="90">
 
 <section id="summary">
 
@@ -581,6 +581,12 @@ server {
 <link id="var_upstream_addr">$upstream_addr</link>.
 </tag-desc>
 
+<tag-name id="var_upstream_cache_key"><var>$upstream_cache_key</var>
+</tag-name>
+<tag-desc>
+используемый ключ кэширования (1.27.1).
+</tag-desc>
+
 <tag-name id="var_upstream_cache_status"><var>$upstream_cache_status</var>
 </tag-name>
 <tag-desc>