diff --git a/index.js b/index.js
index 720eab9..09e2609 100644
--- a/index.js
+++ b/index.js
@@ -6,7 +6,9 @@ var entities = {
   'lt': '<',
   'gt': '>',
   'quot': '"',
-  'nbsp': '\xa0'
+  'nbsp': '\xa0',
+  'pi': 'π',
+  '#039': '\''
 };
 var entityPattern = /&([a-z]+);/ig;