Update README.md

README.md

@@ -1,6 +1,6 @@
 # lolviz
 
-A simple Python data-structure visualization tool for lists of lists, lists, dictionaries; primarily for use in Jupyter notebooks / presentations. It seems that I'm always trying to describe how data is laid out in memory to students. There are really great data structure visualization tools but I wanted something I could use directly via Python in Jupyter notebooks. The look and idea was inspired by the awesome [Python tutor](http://www.pythontutor.com).
+A simple Python data-structure visualization tool for **L**ists **O**f **L**ists, lists, dictionaries, and linked lists; primarily for use in Jupyter notebooks / presentations. It seems that I'm always trying to describe how data is laid out in memory to students. There are really great data structure visualization tools but I wanted something I could use directly via Python in Jupyter notebooks. The look and idea was inspired by the awesome [Python tutor](http://www.pythontutor.com).
 
 There are currently four functions of interest that return `graphviz.files.Source` objects: