Updated runtime files.

runtime/doc/syntax.txt

@@ -1043,6 +1043,21 @@ This works immediately.
 
 CLOJURE							*ft-clojure-syntax*
 
+The default syntax groups can be augmented through the
+*g:clojure_syntax_keywords* and *b:clojure_syntax_keywords* variables. The
+value should be a |Dictionary| of syntax group names to a |List| of custom
+identifiers:
+>
+	let g:clojure_syntax_keywords = {
+	    \ 'clojureMacro': ["defproject", "defcustom"],
+	    \ 'clojureFunc': ["string/join", "string/replace"]
+	    \ }
+<
+Refer to the Clojure syntax script for valid syntax group names.
+
+If the |buffer-variable| *b:clojure_syntax_without_core_keywords* is set, only
+language constants and special forms are matched.
+
 Setting *g:clojure_fold* enables folding Clojure code via the syntax engine.
 Any list, vector, or map that extends over more than one line can be folded
 using the standard Vim |fold-commands|.