diff --git a/README.md b/README.md
index 9337e0b..b4bfefc 100644
--- a/README.md
+++ b/README.md
@@ -6,16 +6,17 @@ Wraps the inline content with `ins` and `del` tags.
 
 Installation
 ------------
-
-    pip install git+git://github.com/aleray/mdx_del_ins.git
-
+    
+    copy mdx_del_ins_markdown_3_0_1.py as a module
 
 Usage
 -----
 
     >>> import markdown
+    >>> from mdx_del_ins_markdown_3_0_1 import DelInsExtension
+
     >>> src = """This is ++added content++ and this is ~~deleted content~~""" 
-    >>> html = markdown.markdown(src, ['del_ins'])
+    >>> html = markdown.markdown(src, extensions=[DelInsExtension()])
     >>> print(html)
     <p>This is <ins>added content</ins> and this is <del>deleted content</del>
     </p>
@@ -24,13 +25,13 @@ Usage
 Dependencies
 ------------
 
-* [Markdown 2.0+](http://www.freewisdom.org/projects/python-markdown/)
+* [Markdown 3.0.1](http://www.freewisdom.org/projects/python-markdown/)
 
 
 Copyright
 ---------
 
-2011, 2012 [The active archives contributors](http://activearchives.org/)
+2011, 2012, 2018 [The active archives contributors](http://activearchives.org/)
 All rights reserved.
 
 This software is released under the modified BSD License. 
diff --git a/mdx_del_ins_markdown_3_0_1.py b/mdx_del_ins_markdown_3_0_1.py
new file mode 100644
index 0000000..82cfb96
--- /dev/null
+++ b/mdx_del_ins_markdown_3_0_1.py
@@ -0,0 +1,43 @@
+# -*- coding: utf-8 -*-
+'''Markdown Del_Ins Extension
+    Compatible with Markdown 3.0.1
+    Extends the Python-Markdown library to support superscript text.
+    Given the text:
+        ~~hello~~
+        ++goodbye++
+    Will output:
+        <del>hello</del> (Strikethrough)
+        <ins>goodbye</ins> (underlined)
+    :copyright: Copyright 2018 Bruno Vermeulen
+    :license: MIT, see LICENSE for details.
+    :use:
+        from mxd_del_ins import DelInsExtension
+        markdown_text = markdown.markdown(text, extensions = [DelInsExtension()])
+
+'''
+from markdown import Extension
+from markdown.inlinepatterns import SimpleTagPattern
+
+# match ^, at least one character that is not ^, and ^ again
+DEL_RE = r"(\~\~)(.+?)(\~\~)"
+INS_RE = r"(\+\+)(.+?)(\+\+)"
+
+
+def makeExtension(*args, **kwargs):  # noqa: N802
+    '''Inform Markdown of the existence of the extension.'''
+    return Del_InsExtension(*args, **kwargs)
+
+
+class DelInsExtension(Extension):
+    '''Extension:
+       text between ~~ characters will be deleted;
+       text between ++ characters will be underlined;
+    '''
+
+    def extendMarkdown(self, md, md_globals):  # noqa: N802
+        """Insert 'del' pattern before 'not_strong' pattern."""
+        md.inlinePatterns.add('del',SimpleTagPattern(DEL_RE, 'del'),
+                              '<not_strong')
+
+        md.inlinePatterns.add('ins', SimpleTagPattern(INS_RE, 'ins'),
+                              '<not_strong')