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diff --git a/TODO b/TODO
index 4a7f47f..06d041c 100644
--- a/TODO
+++ b/TODO
@@ -1,3 +1,7 @@
+From Karim Belabas 9 Jan 2014:
+Implement Hurwitz(s,x) -> gives Zeta for x=1.
+Cf http://arxiv.org/abs/1309.2877
+
 From Andreas Enge 27 August 2012:
 Implement im(atan(x+i*y)) as
 1/4 * [log1p (4y / (x^2 +(1-y)^2))]
@@ -33,6 +37,7 @@ sage: %timeit asin(MPComplexField()(1,1))
 10000 loops, best of 3: 83.7 us per loop
 sage: %timeit asin(MPComplexField()(1,1e-1000))
 100 loops, best of 3: 17 ms per loop
+-> should be much faster with revision 1402 (check)
 
 Same for acos:
 sage: %timeit acos(MPComplexField()(1,1))