diff --git a/sc2/doc/devel/blue-gas-giant-pal.png b/sc2/doc/devel/blue-gas-giant-pal.png
new file mode 100644
index 000000000..0142f212f
Binary files /dev/null and b/sc2/doc/devel/blue-gas-giant-pal.png differ
diff --git a/sc2/doc/devel/planetrender b/sc2/doc/devel/planetrender
index d2b81145e..aa3c908dd 100644
--- a/sc2/doc/devel/planetrender
+++ b/sc2/doc/devel/planetrender
@@ -50,4 +50,5 @@ colormaps per instance are all the same, so that the way a planet
 surface looks does not change with the surface temperature. Notable
 exceptions are: h2o_cts_ (water world) and mtl_cts_ (metal world); there
 could be others as no byte-identical examination was done.
+See blue-gas-giant-pal.png for an example colormap.