diff --git a/doc/Makefile.am b/doc/Makefile.am
index 2c8e97eb2..9f9f46512 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -70,6 +70,8 @@ ORG_FILES = \
   org/g++wrap.in \
   org/init.el.in \
   org/spot.css \
+  org/arch.tex \
+  $(srcdir)/org/arch.png \
   org/autfilt.org \
   org/csv.org \
   org/compile.org \
@@ -110,6 +112,11 @@ $(srcdir)/org/satmin.png: org/satmin.tex
 	pdflatex -shell-escape satmin.tex && \
 	rm -f satmin.pdf satmin.aux satmin.log
 
+$(srcdir)/org/arch.png: org/arch.tex
+	cd $(srcdir)/org && \
+	pdflatex -shell-escape arch.tex && \
+	rm -f arch.pdf arch.aux arch.log
+
 $(srcdir)/org-stamp: $(ORG_FILES) $(configure_ac)
 	$(MAKE) org && touch $@
 
diff --git a/doc/org/arch.tex b/doc/org/arch.tex
new file mode 100644
index 000000000..8773bd6ec
--- /dev/null
+++ b/doc/org/arch.tex
@@ -0,0 +1,67 @@
+\documentclass[convert={size=640}]{standalone}
+\usepackage{tikz}
+\usetikzlibrary{arrows}
+\usetikzlibrary{arrows.meta}
+\usetikzlibrary{shadows}
+\usetikzlibrary{positioning}
+\usetikzlibrary{calc}
+\usetikzlibrary{backgrounds}
+
+\begin{document}
+
+\begin{tikzpicture}
+  \tikzset{cppbox/.style={minimum width=#1,fill=orange!30, minimum height=1.5cm},
+           pybox/.style={minimum width=#1,fill=cyan!30, minimum height=1cm},
+           shbox/.style={minimum width=#1,fill=red!30, minimum height=8mm},
+           usedby/.style={->,ultra thick,>={Stealth[length=5mm,round]},gray!50!black}}
+  \node[cppbox=7.3cm] (libspot) {\texttt{libspot\strut}};
+  \node[cppbox=4.3cm,right=2mm]
+     (libltsmin) at (libspot.east) {\texttt{libspot-ltsmin\strut}};
+  \node[cppbox=8cm,below right,yshift=-2mm,minimum height=8mm] (buddy) at (libspot.south west) {\texttt{libbddx\strut}};
+
+  \node[pybox=4.3cm,above=2mm] (pyltsmin) at (libltsmin.north) {\texttt{import spot.ltsmin\strut}};
+  \node[pybox=3cm,left=2mm] (pyspot) at (pyltsmin.west) {\texttt{import spot\strut}};
+  \node[shbox=4.1cm,above left,xshift=-2mm,align=center] (shcmd) at (pyspot.south west) {
+    \texttt{randltl}\\
+    \texttt{genltl}\\
+    \texttt{ltlfilt}\\
+    \texttt{randaut}\\
+    \texttt{autfilt}\\
+    \texttt{ltl2tgba}\\
+    \texttt{ltl2tgta}\\
+    \texttt{dstar2tgba}\\
+    \texttt{ltlcross}\\
+    \texttt{ltlgrind}\\
+    \texttt{ltldo}
+  };
+  \node[shbox=1.9cm,below left,yshift=-2mm] (divine) at (libltsmin.south east) {\texttt{divine\strut}};
+  \node[shbox=1.5cm,left,xshift=-2mm] (spins) at (divine.west) {\texttt{SpinS\strut}};
+  \node[pybox=7.5cm,above right,yshift=2mm] (ipython) at (pyspot.north west) {IPython / Jupyter};
+  \draw[usedby] (buddy.north) -- ++(0,3mm);
+  \draw[usedby] (buddy.north) ++(3.7cm,0) -- ++(0,3mm);
+  \draw[usedby] (spins.north) -- ++(0,3mm);
+  \draw[usedby] (divine.north) -- ++(0,3mm);
+  \draw[usedby] (libspot.east) -- ++(3mm,0);
+  \draw[usedby] (pyspot.south) ++(0,-2mm) -- ++(0,3mm);
+  \draw[usedby] (pyltsmin.south) ++(0,-2mm) -- ++(0,3mm);
+  \draw[usedby] (shcmd.south) ++(0,-2mm) -- ++(0,3mm);
+  \draw[usedby] (pyspot.north) -- ++(0,3mm);
+  \draw[usedby] (pyltsmin.north) -- ++(0,3mm);
+
+  \begin{pgfonlayer}{background}
+  \path[fill=gray!15,draw=gray,rounded corners=1mm]
+  ($(shcmd.north west)+(-1mm,1mm)$) --
+  ($(shcmd.north east)+(1mm,1mm)$) --
+  ($(pyspot.north west)+(-1mm,1mm)$) --
+  ($(pyltsmin.north east)+(1mm,1mm)$) --
+  ($(libltsmin.south east)+(1mm,-1mm)$) --
+  ($(buddy.north east)+(1mm,1mm)$) --
+  ($(buddy.south east)+(1mm,-1mm)$) --
+  ($(buddy.south west)+(-1mm,-1mm)$) -- cycle;
+  \end{pgfonlayer}
+\end{tikzpicture}
+\end{document}
+%%% Local Variables:
+%%% mode: latex
+%%% TeX-master: t
+%%% End:
diff --git a/doc/org/concepts.org b/doc/org/concepts.org
index e6da60673..15ffe88d8 100644
--- a/doc/org/concepts.org
+++ b/doc/org/concepts.org
@@ -946,13 +946,24 @@ from the command-line, Python, or C++.
    :CUSTOM_ID: architecture
    :END:
 
-The Spot project can be broken down into several main parts:
+[[file:arch.png]]
 
-  - =libbddx=: a customized version of [[http://sourceforge.net/projects/buddy/][the BuDDy library]], for manipulating [[#bdd][BDDs]].
-  - =libspot=: the main library, containing a C++11 implementation of all the
+The Spot project can be broken down into several parts, as shown
+above.  Orange boxes are C/C++ libraries.  Red boxes are command-line
+program.  Blue boxes are Python-related.
+
+  - =libbddx= is a customized version of [[http://sourceforge.net/projects/buddy/][the BuDDy library]], for manipulating [[#bdd][BDDs]].
+  - =libspot= is the main library, containing a C++11 implementation of all the
     data structures and algorithms.  This depends on =libddx=.
-  - [[file:tools.org][command-line tools]]: built upon the =libspot= library, exporting some of its
-    features to shell users
-  - Python bindings for =libbddx= and =libspot=: those make it possible to write
-    python scripts for specific tasks, and allow interactive use of the library
-    via environments such a [[http://ipython.org][IPython/Jupyter]].
+  - all the supplied [[file:tools.org][command-line tools]] are built upon the =libspot=
+    library, exporting some of its features to shell users
+  - =libspot-ltsmin= is a library that helps interfacing Spot with
+    dynamic libraries that [[http://fmt.cs.utwente.nl/tools/ltsmin/][LTSmin]] uses to represent state-spaces.  It
+    currently supports libraries generated from promela models using
+    SpinS or a patched version of DiVinE, but you have to install
+    those third-party tools first.  See [[https://gitlab.lrde.epita.fr/spot/spot/blob/next/tests/ltsmin/README][=tests/ltsmin/README=]]
+    for details.
+  - In addition to the C++11 API, we also provide Python bindings for
+    =libspot-ltsmin= and most of =libspot=.  These are available by
+    importing =spot= or =spot.ltsmin=, and have readily usable in an
+    interactive environment such as the [[http://juptter.org][IPython/Jupyter]] notebook.