In a recent project, I wanted to create a diagram of a repository for the appendix of a paper, including comments to highlight key files and explain how the folders were organised. I found this answer on Stack Exchange by user Gonzalo Medina, which I tweaked to produce the diagram below.

The code is below:
% Adapted from https://tex.stackexchange.com/a/270761 \documentclass[tikz,border=5mm]{standalone} \usepackage[edges]{forest} \definecolor{foldercolor}{RGB}{124,166,198} \newcommand{\size}[2]{{\fontsize{#1}{0}\selectfont#2}} \definecolor{blue}{RGB}{0,50,200} \newcommand{\comment}[0]{\color{blue} \rm} \tikzset{pics/folder/.style={code={% \node[inner sep=0pt, minimum size=#1](-foldericon){}; \node[folder style, inner sep=0pt, minimum width=0.3*#1, minimum height=0.6*#1, above right, xshift=0.05*#1] at (-foldericon.west){}; \node[folder style, inner sep=0pt, minimum size=#1] at (-foldericon.center){};} }, pics/folder/.default={20pt}, folder style/.style={draw=foldercolor!80!black,top color=foldercolor!40,bottom color=foldercolor} } \forestset{is file/.style={edge path'/.expanded={% ([xshift=\forestregister{folder indent}]!u.parent anchor) |- (.child anchor)}, inner sep=1pt}, this folder size/.style={edge path'/.expanded={% ([xshift=\forestregister{folder indent}]!u.parent anchor) |- (.child anchor) pic[solid]{folder=#1}}, inner xsep=0.6*#1}, folder tree indent/.style={before computing xy={l=#1}}, folder icons/.style={folder, this folder size=#1, folder tree indent=3*#1}, folder icons/.default={12pt}, } \begin{document} \begin{forest} for tree={font=\ttfamily, grow'=0, folder indent=.9em, folder icons} [repository [data [cleaned\_plants\_database [experts\_extant.csv {\comment (which species are common and extant according to experts)}, is file] [merged.csv {\comment (the plants database merged from different herbaria and museums)}, is file] ] [processed [first\_last\_detns\_final.csv {\comment (input to SEUX model)}, is file] ] ] [undetected\_extinctions {\comment (shared SEUX model functions)} ] ] \end{forest} \end{document}