diff --git a/src/backends/pyplot.jl b/src/backends/pyplot.jl
index 97cfbef5..feb0d749 100644
--- a/src/backends/pyplot.jl
+++ b/src/backends/pyplot.jl
@@ -612,7 +612,7 @@ function py_add_series(plt::Plot{PyPlotBackend}, series::Series)
             alpha = series[:fillalpha],
             cmap = py_fillcolormap(series),  # applies to the pcolorfast object
             zorder = series[:series_plotindex],
-            # extrakw...  # for some reason vmin and vmax are NaN???
+            extrakw...  # for some reason vmin and vmax are NaN??? hexbin works without passing vmin and vmax
         )
         push!(handles, handle)
     end