diff --git a/contents/tech-extensions.tex b/contents/tech-extensions.tex
new file mode 100644
index 0000000000000000000000000000000000000000..8c3270469a592376be60ea60cdb3b75b07541b0b
--- /dev/null
+++ b/contents/tech-extensions.tex
@@ -0,0 +1,17 @@
+% -----------------------------------------------------------------------------
+% Extensions technical documentation
+%
+% Author: Thomas Lambert <t.lambert@uliege.be>
+% ULiege - Aeroelasticity and Experimental Aerodynamics
+% https://gitlab.uliege.be/thlamb/Rotare-doc
+%
+% License: CC-BY-SA-4.0
+% This work is licensed under a Creative Commons Attribution-ShareAlike 4.0
+% International License (https://creativecommons.org/licenses/by-sa/4.0/)
+% ------------------------------------------------------------------------------
+
+\chapter{Extensions and corrections}
+\label{chap:tech:ext}
+
+
+
diff --git a/rotare-doc.tex b/rotare-doc.tex
index a6ed2d24bc31412368547974952b55e730bd9cd4..56a5ad7cd8bbddc3837f8e047a6ef6da75cc518e 100644
--- a/rotare-doc.tex
+++ b/rotare-doc.tex
@@ -146,6 +146,7 @@ draft=false,            % toggle if draft version
 \input{contents/intro}   % Introduction
 
 \part{User manual}
+\label{part:user}
 \input{contents/user-install}
 \input{contents/user-usage}
 \input{contents/definitions}
@@ -153,9 +154,10 @@ draft=false,            % toggle if draft version
 \input{contents/user-troubleshooting}
 
 \part{Technical documentation}
+\label{part:tech}
 %\input{contents/tech-architecture}
 \input{contents/tech-solvers}
-%\input{contents/tech-extensions}
+\input{contents/tech-extensions}
 %\input{contents/tech-validation}
 %\input{contents/tech-roadmap}