diff --git a/img/seq_file.png b/img/seq_file.png
deleted file mode 100644
index 4d15a3a..0000000
Binary files a/img/seq_file.png and /dev/null differ
diff --git a/lkmpg.tex b/lkmpg.tex
index 0a66089..7595f2e 100644
--- a/lkmpg.tex
+++ b/lkmpg.tex
@@ -5,6 +5,16 @@
 \usepackage{graphicx}
 \usepackage{fancyhdr}
 
+% tikz settings
+\usepackage{tikz}
+\usetikzlibrary{shapes.geometric, arrows, shadows, decorations.text}
+\tikzstyle{startstop} = [rectangle, rounded corners, minimum width=3cm, minimum height=1cm,text centered, draw=black, fill=red!30, drop shadow]
+\tikzstyle{io} = [trapezium, trapezium left angle=70, trapezium right angle=110, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill=blue!30]
+\tikzstyle{process} = [rectangle, minimum width=3cm, minimum height=1cm, text centered, text width=3cm, draw=black, fill=orange!30]
+\tikzstyle{decision} = [diamond, minimum width=1cm, minimum height=1cm, text centered, draw=black, fill=green!30]
+\tikzstyle{arrow} = [thick,->,>=stealth]
+\tikzstyle{line} = [draw, -latex']
+
 % packages for code
 \usepackage{verbatim}
 \usepackage{minted}
@@ -733,7 +743,23 @@ non NULL value, the function next() is called. This function is an iterator, the
 BE CARREFUL: when a sequence is finished, another one starts. That means that at the end of function stop(), the function start() is called again. This loop finishes when the function start() returns NULL. You can see a scheme of this in the figure "How seq\_file works".
 
 \begin{center}
-\includegraphics[width=.9\linewidth]{img/seq_file.png}
+  \begin{tikzpicture}[node distance=2cm, thick]
+    \node (start) [startstop] {start() treatment};
+    \node (branch1) [decision, below of=start, yshift=-1cm] {return is NULL?};
+    \node (emptynode) [right of=branch1, xshift=2cm] {Yes};
+    \node (next) [process, below of=branch1, yshift=-1cm] {next() treatment};
+    \node (branch2) [decision, below of=next, yshift=-1cm] {return is NULL?};
+    \node (stop) [startstop, below of=branch2, yshift=-1cm] {stop() treatment};
+
+
+    \draw [->] (start) -- (branch1);
+    \draw [->] (branch1) -- node[anchor=east] {} (emptynode);
+    \draw [->] (branch1) -- node[left=2em, anchor=south] {No} (next);
+    \draw [->] (next) -- (branch2);
+    \draw [->] (branch2.west) to [out=135, in=-135, bend left=45] node [left] {No} (next.west);
+    \draw [->] (branch2) -- node[left=2em, anchor=south] {Yes} (stop);
+    \draw [->] (stop.west) to [out=135, in=-135] node [left] {} (start.west);
+  \end{tikzpicture}
 \end{center}
 Seq\_file provides basic functions for proc\_ops, as seq\_read, seq\_lseek, and some others. But nothing to write in the /proc file. Of course, you can still use the same way as in the previous example.