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+title: Smart Strong Extension
+
+Smart_Strong
+============
+
+Summary
+-------
+
+The Smart_Strong extension adds smarter handling of double underscores within
+words. This does for double underscores what [smart_emphasis][] does for single
+underscores.
+
+The Smart_Strong extension is included in the standard Markdown library.
+
+[smart_emphasis]: ../reference.md#smart_emphasis
+
+Example
+-------
+
+```pycon
+>>> import markdown
+>>> markdown.markdown('Text with double__underscore__words.', \
+                      extensions=['markdown.extensions.smart_strong'])
+u'<p>Text with double__underscore__words.</p>'
+>>> markdown.markdown('__Strong__ still works.', \
+                      extensions=['markdown.extensions.smart_strong'])
+u'<p><strong>Strong</strong> still works.</p>'
+>>> markdown.markdown('__this__works__too__.', \
+                      extensions=['markdown.extensions.smart_strong'])
+u'<p><strong>this__works__too</strong>.</p>'
+```
+
+Usage
+-----
+
+See [Extensions](index.md) for general extension usage, specify
+`markdown.extensions.smart_strong` as the name of the extension.
+
+This extension does not accept any special configuration options.