diff --git a/demo/docs/powershell.ps1 b/demo/docs/powershell.ps1
index cbcbb20f..d3eb9875 100644
--- a/demo/docs/powershell.ps1
+++ b/demo/docs/powershell.ps1
@@ -3,6 +3,16 @@ function Hello($name) {
   Write-host "Hello $name"
 }
 
+function add($left, $right=4) {
+    if ($right -ne 4) {
+        return $left
+    } elseif ($left -eq $right) {
+        return 3
+    } else {
+        return 2
+    }
+}
+
 $number = 1 + 2;
 $number += 3
 
@@ -12,4 +22,3 @@ $an_array = @(1, 2, 3)
 $a_hash = @{"something" = "something else"}
 
 & notepad .\readme.md
-
diff --git a/lib/ace/mode/powershell_highlight_rules.js b/lib/ace/mode/powershell_highlight_rules.js
index 7681044d..536b49c4 100644
--- a/lib/ace/mode/powershell_highlight_rules.js
+++ b/lib/ace/mode/powershell_highlight_rules.js
@@ -52,7 +52,7 @@ var PowershellHighlightRules = function() {
                 regex : "[a-zA-Z_$][a-zA-Z0-9_$]*\\b"
             }, {
                 token : "keyword.operator",
-                regex : "eq|ne|ge|gt|lt|le|like|notlike|match|notmatch|replace"
+                regex : "\\-(?:" + "eq|ne|ge|gt|lt|le|like|notlike|match|notmatch|replace" + ")"
             }, {
                 token : "lparen",
                 regex : "[[({]"