diff --git a/chapter/mgmt.tex b/chapter/mgmt.tex
index 10d29cd..033ba48 100644
--- a/chapter/mgmt.tex
+++ b/chapter/mgmt.tex
@@ -365,6 +365,8 @@ Cisco switches allow by default only the following 3 protos until the client is
 	\end{itemize}
 \end{itemize}
 
+\xkcd{hardware_reductionism}{Remember to look into what features a version supports before using it}
+
 \fig[http://ccieordie.com/tag/6-1b/]{snmp/snmpcomparison2}{snmpcomparison2}{\gls{snmp} comparison}
 
 \begin{cisco}
diff --git a/commands.tex b/commands.tex
index 8aa152a..a8a57df 100644
--- a/commands.tex
+++ b/commands.tex
@@ -25,7 +25,7 @@
 
 \newcommand{\xkcd}[2]{\fig{xkcd/#1}{#1}{#2\\%
 {\tiny\MakeUppercase{https://imgs.xkcd.com/comics/#1.png}\hskip3mm%
-License: \href{https://creativecommons.org/licenses/by-nc/2.5/}{CC BY-NC 2.5}%
+License: \texttt{\href{https://creativecommons.org/licenses/by-nc/2.5/}{CC BY-NC 2.5}}%
 }}}
 
 % Usage: \svg{<path-to-file>}{<label>}{<caption>}
diff --git a/structure.tex b/structure.tex
index 0512da3..81cb6aa 100644
--- a/structure.tex
+++ b/structure.tex
@@ -47,6 +47,9 @@
     urlcolor=darkgray]{hyperref} % https://en.wikibooks.org/wiki/LaTeX/Hyperlinks
 
 
+\catcode`\_=12
+
+
 \bibliographystyle{unsrtnat} %styles list https://www.sharelatex.com/learn/Natbib_bibliography_styles