diff --git a/lib/ace/mode/latex_highlight_rules.js b/lib/ace/mode/latex_highlight_rules.js
index 05a77c89..c1794fab 100644
--- a/lib/ace/mode/latex_highlight_rules.js
+++ b/lib/ace/mode/latex_highlight_rules.js
@@ -15,7 +15,7 @@ var LatexHighlightRules = function() {
         },{
             // Documentclass and usepackage
             token : ["keyword","lparen","variable.parameter","rparen", "lparen","storage.type","rparen"],
-            regex : "(\\\\(?:documentclass|usepackage))(?:(\\[)([^\\]]*)(\\]))?({)(\\w*)(})"
+            regex : "(\\\\(?:documentclass|usepackage|input))(?:(\\[)([^\\]]*)(\\]))?({)(\\w*)(})"
         },{
             // A label
             token : ["keyword","lparen","variable.parameter","rparen"],