diff --git a/lib/ace/mode/html_highlight_rules.js b/lib/ace/mode/html_highlight_rules.js
index 6d2221e3..1c445fe3 100644
--- a/lib/ace/mode/html_highlight_rules.js
+++ b/lib/ace/mode/html_highlight_rules.js
@@ -62,6 +62,9 @@ var HtmlHighlightRules = function() {
             merge : true,
             regex : "<\\!--",
             next : "comment"
+        }, {
+            token : "xml_pe",
+            regex : "<\\!.*?>"
         }, {
             token : "meta.tag",
             regex : "<(?=\s*script\\b)",
@@ -77,6 +80,9 @@ var HtmlHighlightRules = function() {
         }, {
             token : "text",
             regex : "\\s+"
+        }, {
+            token : "entity.reference",
+            regex : "(?:&#[0-9]+;)|(?:&#x[0-9a-fA-F]+;)|(?:&[a-zA-Z0-9_:\\.-]+;)"
         }, {
             token : "text",
             regex : "[^<]+"