diff --git a/content/assignment/proposal-final.md b/content/assignment/proposal-final.md
index 0820e69..1787d24 100644
--- a/content/assignment/proposal-final.md
+++ b/content/assignment/proposal-final.md
@@ -43,3 +43,6 @@ Please create your proposal in a markdown file called `proposal.md` in the root
 - Parsing extensible data formats (JSON, XML)
 - Use of spatial vector data (`sf` package) and visualization of spatial data
 - Creation of an R package
+- Use of `purrr` package functions for [iteration](http://r4ds.had.co.nz/iteration.html)
+- Manipulation of [dates](http://r4ds.had.co.nz/dates-and-times.html) or [strings](http://r4ds.had.co.nz/strings.html)
+- Unique challenges you encounter: particularly messy data/ non-standard formats, special emphasis on visualization or presentation of results.
diff --git a/docs/assignment/proposal-final/index.html b/docs/assignment/proposal-final/index.html
index 4479de7..f3dcd15 100644
--- a/docs/assignment/proposal-final/index.html
+++ b/docs/assignment/proposal-final/index.html
@@ -155,6 +155,9 @@ <h3 id="and-at-least-three-of-the-following-skills-this-list-may-be-modified-ext
 <li>Parsing extensible data formats (JSON, XML)</li>
 <li>Use of spatial vector data (<code>sf</code> package) and visualization of spatial data</li>
 <li>Creation of an R package</li>
+<li>Use of <code>purrr</code> package functions for <a href="http://r4ds.had.co.nz/iteration.html">iteration</a></li>
+<li>Manipulation of <a href="http://r4ds.had.co.nz/dates-and-times.html">dates</a> or <a href="http://r4ds.had.co.nz/strings.html">strings</a></li>
+<li>Unique challenges you encounter: particularly messy data/ non-standard formats, special emphasis on visualization or presentation of results.</li>
 </ul>
 
 	      </div>