diff --git a/lib/ace/mode/powershell_highlight_rules.js b/lib/ace/mode/powershell_highlight_rules.js
index e1caf7c3..bce69c3d 100644
--- a/lib/ace/mode/powershell_highlight_rules.js
+++ b/lib/ace/mode/powershell_highlight_rules.js
@@ -13,6 +13,7 @@ var PowershellHighlightRules = function() {
     );
 
     var builtinFunctions = lang.arrayToMap(
+      // TODO: fill out this list
       ("Write-Host").split("|")
     );
 
@@ -65,6 +66,9 @@ var PowershellHighlightRules = function() {
             }, {
                 token : "keyword.operator",
                 regex : "\\-(?:" + binaryOperatorsRe + ")"
+            }, {
+                token : "keyword.operator",
+                regex : "&|\\*|\\+|\\-|\\=|\\+=|\\-="
             }, {
                 token : "lparen",
                 regex : "[[({]"