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diff --git a/crs/README b/crs/README
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--- a/crs/README
+++ b/crs/README
@@ -5,6 +5,13 @@ with the "local mutation" modification, as defined by:
        search algorithm for global optimization," J. Optim. Theory Appl.
        130 (2), 253-264 (2006).
 
+The original CRS2 algorithm was described by:
+
+       W. L. Price, "A controlled random search procedure for global
+       optimization," in Towards Global Optimization 2, p. 71-84
+       edited by L. C. W. Dixon and G. P. Szego (North-Holland Press,
+       Amsterdam, 1978).
+
 It is under the same MIT license as the rest of my code in NLopt (see
 ../COPYRIGHT).