diff --git a/doc/userdoc.org b/doc/userdoc.org
index 52eca06e12795e593eb878306da57dd8eb2ad9cd..2d4626d3b314c76c082523df4ac57318df7e5ba3 100644
--- a/doc/userdoc.org
+++ b/doc/userdoc.org
@@ -113,6 +113,7 @@ The example is quite easy to read.
   unset key
   unset xtics
   unset ytics
+  set terminal png truecolor enhanced
   set size square
   plot '<(sed "" $PUGS_SOURCE_DIR/doc/transformed.0000.gnu)' w l
 #+END_SRC