diff --git a/runtime/doc/syntax.txt b/runtime/doc/syntax.txt
index 0fd9769..6365e36 100644
--- a/runtime/doc/syntax.txt
+++ b/runtime/doc/syntax.txt
@@ -1,4 +1,4 @@
-*syntax.txt*	For Vim version 8.1.  Last change: 2019 Jul 15
+*syntax.txt*	For Vim version 8.1.  Last change: 2019 Sep 19
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -1923,6 +1923,16 @@
 number is that redrawing can become slow.
 
 
+JSON						*json.vim* *ft-json-syntax*
+
+The json syntax file provides syntax highlighting with conceal support by
+default. To disable concealment: >
+	let g:vim_json_conceal = 0
+
+To disable syntax highlighting of errors: >
+	let g:vim_json_warnings = 0
+
+
 LACE						*lace.vim* *ft-lace-syntax*
 
 Lace (Language for Assembly of Classes in Eiffel) is case insensitive, but the