diff --git a/presentations/CNN-Intro/CNN-Intro.pdf b/presentations/CNN-Intro/CNN-Intro.pdf
index 790f87f..17c591f 100644
Binary files a/presentations/CNN-Intro/CNN-Intro.pdf and b/presentations/CNN-Intro/CNN-Intro.pdf differ
diff --git a/presentations/CNN-Intro/CNN-Intro.tex b/presentations/CNN-Intro/CNN-Intro.tex
index 5497b7a..debf6b7 100644
--- a/presentations/CNN-Intro/CNN-Intro.tex
+++ b/presentations/CNN-Intro/CNN-Intro.tex
@@ -21,16 +21,6 @@
 \author{Martin Thoma -- \footnotesize \href{http://tinyurl.com/CNN-Intro}{tinyurl.com/CNN-Intro}}
 \date{22. February 2019}
 \subject{Machine Learning, AI, Neural Networks, Convolutional Neural Networks}
-% \titlegraphic{\href{http://tinyurl.com/CNN-Intro}{tinyurl.com/CNN-Intro}}
-% \begin{titlepage}
-%     \begin{center}
-%         \href{http://tinyurl.com/CNN-Intro}{tinyurl.com/CNN-Intro}
-%     \end{center}
-% \end{titlepage}
-% \begin{titlepage}
-% \maketitle
-% \href{http://tinyurl.com/CNN-Intro}{tinyurl.com/CNN-Intro}
-% \end{titlepage}
 
 \frame{\titlepage}
 
@@ -99,7 +89,8 @@
 \begin{frame}{Convolution}
 \begin{figure}[ht]
     \centering
-    \includegraphics[width=0.8\paperwidth]{graphics/convolution-linear.pdf}
+    \includegraphics[width=0.8\paperwidth]{graphics/convolution-linear.pdf}\\
+    \href{https://martin-thoma.com/graphic-filters/}{martin-thoma.com/graphic-filters}
 \end{figure}
 \end{frame}
 
@@ -132,8 +123,6 @@
 \inputminted[linenos,
                numbersep=7pt,
                gobble=0,
-               % frame=none,
-               % framesep=2mm,
                 fontsize=\footnotesize, tabsize=4]{python}{cnn.py}
 \end{frame}