diff --git a/nix/build.nix b/nix/build.nix
index f0d9a02..3532866 100755
--- a/nix/build.nix
+++ b/nix/build.nix
@@ -12,10 +12,11 @@ stdenv.mkDerivation {
   buildPhase = ''
     dot -Tpdf brotherhood.dot > brotherhood.pdf
     dot -Tsvg brotherhood.dot > brotherhood.svg
+    dot -Tpng brotherhood.dot > brotherhood.png
   '';
 
   installPhase = ''
     mkdir -p $out
-    cp -r *.pdf *.svg $out
+    cp -r *.pdf *.svg *.png $out
   '';
 }
\ No newline at end of file