Fix link in doc

timhoffm · timhoffm · commit 8563dd8f22de · 2020-06-06T00:36:43.000+02:00
diff --git a/examples/showcase/mandelbrot.py b/examples/showcase/mandelbrot.py
@@ -42,7 +42,7 @@ def mandelbrot_set(xmin, xmax, ymin, ymax, xn, yn, maxiter, horizon=2.0):
 
     # Normalized recount as explained in:
     # https://linas.org/art-gallery/escape/smooth.html
-    # https://www.ibm.com/developerworks/community/blogs/jfp/entry/My_Christmas_Gift
+    # https://web.archive.org/web/20160331171238/https://www.ibm.com/developerworks/community/blogs/jfp/entry/My_Christmas_Gift?lang=en
 
     # This line will generate warnings for null values but it is faster to
     # process them afterwards using the nan_to_num
