diff --git a/reference/wincache/functions/wincache_lock.xml b/reference/wincache/functions/wincache_lock.xml
index 86683861b5..d2f16f8b1b 100644
--- a/reference/wincache/functions/wincache_lock.xml
+++ b/reference/wincache/functions/wincache_lock.xml
@@ -12,6 +12,7 @@
   <methodsynopsis>
    <type>bool</type><methodname>wincache_lock</methodname>
    <methodparam><type>string</type><parameter>key</parameter></methodparam>
+   <methodparam choice="opt"><type>bool</type><parameter>isglobal</parameter><initializer>false</initializer></methodparam>
   </methodsynopsis>
   <para>
    Obtains an exclusive lock on a given key. The execution of the current script will be blocked until the 
@@ -39,6 +40,15 @@
       </para>
      </listitem>
     </varlistentry>
+    <varlistentry>
+     <term><parameter>isglobal</parameter></term>
+     <listitem>
+      <para>
+       Controls whether the scope of the lock is system-wide or local. Local locks are scoped to the application pool 
+       in IIS FastCGI case or to all php processes that have the same parent process identifier.
+      </para>
+     </listitem>
+    </varlistentry>
    </variablelist>
   </para>
  </refsect1>