--- a/xml/en/docs/njs/reference.xml	Thu Mar 25 19:24:37 2021 +0000
+++ b/xml/en/docs/njs/reference.xml	Mon Mar 29 19:40:27 2021 +0100
@@ -9,7 +9,7 @@
 <article name="Reference"
         link="/en/docs/njs/reference.html"
         lang="en"
-        rev="72">
+        rev="73">
 
 <section id="summary">
 
@@ -458,10 +458,26 @@
 <tag-desc>
 nginx variables object, writable
 (since <link doc="changes.xml" id="njs0.2.8">0.2.8</link>).
-A variable can be writable only
-if it is referenced in nginx configuration file.
+
+<para>
+A variable is writable if:
+<list type="bullet">
+
+<listitem>
+it was created using the <literal>js_var</literal> directive for
+<link doc="../http/ngx_http_js_module.xml" id="js_var">http</link> or
+<link doc="../stream/ngx_stream_js_module.xml" id="js_var">stream</link>
+(since <link doc="changes.xml" id="njs0.5.3">0.5.3</link>)
+</listitem>
+
+<listitem>
+it is referenced in nginx configuration file
+</listitem>
+
+</list>
 Even so, some embedded variables still cannot be assigned a value (for example,
 <link doc="../http/ngx_http_core_module.xml" id="var_http_"><literal>$http_</literal></link>).
+</para>
 </tag-desc>
 
 <tag-name id="r_warn"><literal>r.warn(<value>string</value>)</literal></tag-name>