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diff --git a/docs/examples/userguide/numpy_ufuncs/ufunc.pyx b/docs/examples/userguide/numpy_ufuncs/ufunc.pyx
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+++ b/docs/examples/userguide/numpy_ufuncs/ufunc.pyx
@@ -0,0 +1,8 @@
+# tag: numpy
+cimport cython
+
+
+@cython.ufunc
+cdef double add_one(double x):
+ # of course, this simple operation can already by done efficiently in Numpy!
+ return x+1