diff --git a/reference/opcache/ini.xml b/reference/opcache/ini.xml
index 427c8601ee..b14e922d8a 100644
--- a/reference/opcache/ini.xml
+++ b/reference/opcache/ini.xml
@@ -688,7 +688,9 @@
     </term>
     <listitem>
      <para>
-      
+      Produces opcode dumps for debugging different stages of optimizations.
+      0x10000 will output opcodes as the compiler produced them before any optimization occurs 
+      while 0x20000 will output optimized codes.
      </para>
     </listitem>
    </varlistentry>