diff --git a/markdown-include.js b/markdown-include.js
index e98cbdd..ca12dfc 100644
--- a/markdown-include.js
+++ b/markdown-include.js
@@ -12,8 +12,8 @@ var q = require('q');
 
 this.ignoreTag = ' !ignore';
 this.headingTag = ' !heading';
-this.includePattern = /^#include\s"(.+\/|\/|\w|-|\/)+.md"/gm;
-this.ignorePattern = new RegExp('^#include\\s"(.+\\/|\\/|\\w|-|\\/)+.md"' + this.ignoreTag, 'gm');
+this.includePattern = /^#include\s"(.+\/|\/|\w|-|\/)+\.(md|markdown)"/gm;
+this.ignorePattern = new RegExp('^#include\\s"(.+\\/|\\/|\\w|-|\\/)+\.(md|markdown)"' + this.ignoreTag, 'gm');
 this.headingPattern = new RegExp('^#+\\s.+' + this.headingTag, 'gm');
 this.tableOfContents = '';
 this.build = {};
diff --git a/package.json b/package.json
index 1eae0ea..aabe987 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "markdown-include",
-  "version": "0.4.2",
+  "version": "0.4.3",
   "description": "Include markdown files into other markdown files with C style syntax.",
   "main": "markdown-include.js",
   "repository": {