Recommend mbstring as an extension

danielbachhuber · danielbachhuber · commit b2b1dfe18f5c · 2014-09-10T05:36:54.000-07:00
diff --git a/README.md b/README.md
@@ -9,6 +9,10 @@ Requirements
 
  * PHP >= 5.3
 
+Suggested PHP extensions
+ 
+ * mbstring - Used for calculating string widths.
+
 Function List
 -------------
 
