diff --git a/trunk/Resource/ConfLSL.xml b/trunk/Resource/ConfLSL.xml
index 9c35136..70abbcb 100644
--- a/trunk/Resource/ConfLSL.xml
+++ b/trunk/Resource/ConfLSL.xml
@@ -4735,6 +4735,7 @@
 		</WordsSubsection>
 
 		<WordsSubsection name="C.26 JSON constants">
+			<Word name="JSON_APPEND" type="integer" value="-1"/>
 			<Word name="JSON_ARRAY" type="string" value="">U+FDD2</Word>
 			<Word name="JSON_FALSE" type="string" value="">U+FDD7</Word>
 			<Word name="JSON_INVALID" type="string" value="">U+FDD0</Word>