diff -ur patsy-0.5.1/doc/spline-regression.rst patsy-0.5.1.spline/doc/spline-regression.rst
--- patsy-0.5.1/doc/spline-regression.rst	2020-06-29 00:16:16.274292992 +0200
+++ patsy-0.5.1.spline/doc/spline-regression.rst	2020-06-29 00:16:47.936763668 +0200
@@ -162,6 +162,7 @@
 marginal spline bases patterns can be observed on the x and y contour projections:
 
 .. ipython::
+   :okwarning:
 
    In [10]: from matplotlib import cm