diff --git a/lbol.tex b/lbol.tex
index abec888..ab26ac1 100644
--- a/lbol.tex
+++ b/lbol.tex
@@ -1717,6 +1717,37 @@ $ texhash ~/texmf
 
 \chapter{Miscellaneous}
 
+\section{\LaTeX{} Units}
+
+\LaTeX{} is pretty loose about which unit you use. You can use any of the following pretty much interchangeably, depending on what you are measuring.
+
+\begin{longtblr}
+[
+	caption = {\LaTeX{} Units and Lengths},
+	label   = {tb:units}
+]{
+	width   = {0.8\textwidth},
+	colspec = { X[1,l] X[3,l] },
+	hlines  = {0.75pt,solid},
+	vline{1,3}  = {0.75pt,solid},
+	rows    = {5mm, m, rowsep=1.5pt}
+}
+pt & point, the default length unit, equal to approximately 0.3515mm \\
+mm & millimeters \\
+cm & centimeters \\
+in & inches \\
+ex & the height of the letter \texttt{x} in the current font \\
+em & the width of the letter \texttt{m} in the current font \\
+\Verb+\columnsep+ & the distance between columns \\
+\Verb+\columnwidth+ & the width of the column \\
+\Verb+\linewidth+ & the width of the line in the current environment \\
+\Verb+\paperwidth+ & the width of the page \\
+\Verb+\paperheight+ & the height of the page \\
+\Verb+\textwidth+ & the width of the text \\
+\Verb+\textheight+ & the height of the text \\
+\Verb+\unitlength+ & the unit of length in the \texttt{picture} environment
+\end{longtblr}
+
 
 \begin{itemize}[noitemsep]
 	\item Notice that your footnotes are floating above the footer on some pages? Try adding \verb+\usepackage[bottom]{footmisc}+ to your preamble.