AS OF MAY 2016, THIS PLUGIN IS NOT BEING MAINTAINED AND WILL NOT RECEIVE ANY FUTURE UPDATES. 
CONTACT ME IF YOU’D LIKE TO LIST AN ALTERNATIVE HERE.
Alternatives: 
– https://wordpress.org/plugins/footnotation/
This plugin provides an extremely easy way to add elegant looking footnotes to 
your posts. The syntax is natural, simple to understand, and degrades 
gracefully if the plugin is removed. Footnotes are linked unobtrusively and the 
note itself links back to the original text where the footnote is referenced.
Adding footnotes to a post is simple. Just type them inline in your post in 
square brackets like this:
<pre><code> [1. This is a footnote.]
</code></pre>
Each footnote must have a number followed by a period and a space and then the 
actual footnote. They don’t have to be unique but it is recommended. It doesn’t 
matter what the numbers are since the footnotes will be automatically 
renumbered when the post is displayed.
Footnotes can contain anything you’d like including links, images, etc. 
Footnotes are automatically linked back to the spot in the text where the note 
was made.
<h4>Settings</h4>
Only show footnotes on single post/page: This option will hide 
footnotes on the main blog page. Footnote numbers will still appear 
but link to the individual post/page URL.
Collapse footnotes until clicked: When checked, footnotes are 
hidden until manually expanded or a footnote number is clicked.
Note: Do not include square brackets [] inside the footnotes themselves.
Note: Footnote numbers don’t need to be unique but it is recommended, 
especially if the text is identical for multiple footnotes. If you have 
multiple footnotes with the exact same text and number then you’ll get weird 
and incorrect footnotes on your post.

FD Footnotes Plugin

Add elegant looking footnotes to your posts simply and naturally.

Florian TIAR

vhbelvadi

Based on the now unsupported fd-footnotes plugin, Footnotation provides 
an easy way to add footnotes to your posts.
The syntax is retained from fd-footnotes which means it is natural, simple to 
understand, and degrades gracefully even if the plugin is removed. Bidirectional 
links are created automatically between a footnote and its position in the main 
content where the footnote was referenced from so that readers can refer to 
a footnote and return to their place in the text they were reading, with ease.
To make a footnote, type it inline within arbitrarily numbered square brackets:
<pre><code> [7. Example footnote.]
</code></pre>
The syntax is important. Each pair of square brackets must contain a number 
followed by a full stop and a space and then have the footnote text itself.
Neither do the numbers have to be in order nor do they have to be unique. All 
footnotes will be re-numbered automatically.
<h4>Settings</h4>
Show footnotes only on single posts or pages: This option hides the list of 
footnotes on the main blog page but retains their numbers which will link to the 
individual post/page URL directly.
Collapse footnotes until they are clicked on: This option hides footnotes 
initially, expanding them only when a footnote reference is clicked on.
Match footnote marker colour to surrounding text: This option makes sure the 
footnote reference marker matches the body text (academic style). The default 
option is to have the footnote marker match the website’s default link colour 
(web style).
NB Anything from links to formatting to images may be included inside a 
footnote, except square brackets.
NB Multiple footnotes with the same text and number will leave you with incorrect 
footnotes. Make sure either that all footnotes have different content or, two or 
more footnotes with the same content all have different numbers.

Footnotation

An easy way to add footnotes to your posts.

FD Footnotes Plugin vs Footnotation