diff --git a/tech-doc/tech-spec.tex b/tech-doc/tech-spec.tex
index 7f47466..29e5f60 100644
--- a/tech-doc/tech-spec.tex
+++ b/tech-doc/tech-spec.tex
@@ -179,12 +179,13 @@ The communication between the host device and the TBM follows a client-server mo
 \draw[thick,draw=red!70!black,->] (7.75, 0) -- ++(.5,4) node[midway, sloped, below] {\color{red!70!black}\tt\small\uppercase{1501842512}};
 
 \draw[thick,draw=blue!70!black,->] (9, 4) -- ++(.5,-4) node[midway, sloped, below] {\color{blue!70!black}\tt\small\uppercase{booting <version>}};
-\draw[thick,draw=red!70!black,->] (9.75, 0) -- ++(.5,4) node[midway, sloped, below] {\color{red!70!black}\tt\small\uppercase{ok}};
 
-\draw[thick,draw=red!70!black,dashed] (12, 0) -- ++(0, 4) node[midway, sloped, above] {\color{red!70!black}\tt\small\uppercase{untrusted}};
+\draw[thick,draw=red!70!black,dashed] (10, 0) -- ++(0, 4) node[midway, sloped, above] {\color{red!70!black}\tt\small\uppercase{untrusted}};
 
-\draw[thick,draw=blue!70!black,->] (13, 4) -- ++(.5,-4) node[midway, sloped, below] {\color{blue!70!black}\tt\small\uppercase{booting ok}};
-\draw[thick,draw=red!70!black,->] (13.75, 0) -- ++(.5,4) node[midway, sloped, below] {\color{red!70!black}\tt\small\uppercase{ok}};
+\draw[thick,draw=red!70!black,->] (10.5, 0) -- ++(.5,4) node[midway, sloped, below] {\color{red!70!black}\tt\small\uppercase{ok}};
+
+\draw[thick,draw=blue!70!black,->] (11.5, 4) -- ++(.5,-4) node[midway, sloped, below] {\color{blue!70!black}\tt\small\uppercase{booting ok}};
+\draw[thick,draw=red!70!black,->] (12.25, 0) -- ++(.5,4) node[midway, sloped, below] {\color{red!70!black}\tt\small\uppercase{ok}};
 \end{tikzpicture}
 \end{adjustbox}
 \caption{protocol diagram.}