diff --git a/appendices/reserved.xml b/appendices/reserved.xml
index 0c9f9b8429..397f08f9ab 100644
--- a/appendices/reserved.xml
+++ b/appendices/reserved.xml
@@ -209,6 +209,9 @@
        <entry>
         <link linkend="language.constants.predefined">__FILE__</link>
        </entry>
+       <entry>
+        <link linkend="language.constants.predefined">__LINE__</link>
+       </entry>
        <entry>
         <link linkend="language.constants.predefined">__FUNCTION__</link>
        </entry>