improve quadgk docs (fix #10649)

JuliaLang · Mar 28, 2015 · b535042 · b535042 · ViralBShah · Mar 28, 2015
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commit b535042
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diff --git a/doc/stdlib/math.rst b/doc/stdlib/math.rst
@@ -1690,6 +1690,14 @@ some built-in integration support in Julia.
    Alternatively, a different norm can be specified by passing a `norm`-like
    function as the `norm` keyword argument (which defaults to `vecnorm`).
 
+   [Only one-dimensional integrals are provided by this function.  For
+   multi-dimensional integration (cubature), there are many different
+   algorithms (often much better than simple nested 1d integrals)
+   and the optimal choice tends to be very problem-dependent.  See
+   the Julia external-package listing for available algorithms for
+   multidimensional integration or other specialized tasks (such as
+   integrals of highly oscillatory or singular functions).]
+
    The algorithm is an adaptive Gauss-Kronrod integration technique:
    the integral in each interval is estimated using a Kronrod rule
    (``2*order+1`` points) and the error is estimated using an embedded