diff --git a/src/deep-learning/img/_perceptron_nand.pdf b/src/deep-learning/img/_perceptron_nand.pdf
new file mode 100644
index 0000000..4cd54e9
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diff --git a/src/deep-learning/img/_xor.pdf b/src/deep-learning/img/_xor.pdf
new file mode 100644
index 0000000..ab43d4d
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diff --git a/src/deep-learning/sections/_expressivity.tex b/src/deep-learning/sections/_expressivity.tex
index e30c960..bda960a 100644
--- a/src/deep-learning/sections/_expressivity.tex
+++ b/src/deep-learning/sections/_expressivity.tex
@@ -18,12 +18,12 @@ Single neuron that defines a binary threshold through a hyperplane:
         \begin{center}
             \begin{minipage}{.2\textwidth}
                 \centering
-                \includegraphics[width=\textwidth]{img/perceptron_nand.pdf}
+                \includegraphics[width=\textwidth]{img/_perceptron_nand.pdf}
                 \tiny NAND
             \end{minipage}
             \begin{minipage}{.2\textwidth}
                 \centering
-                \includegraphics[width=\textwidth]{img/xor.pdf}
+                \includegraphics[width=\textwidth]{img/_xor.pdf}
                 \tiny XOR
             \end{minipage}
         \end{center}