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diff --git a/src/ChangeLog b/src/ChangeLog
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 2013-11-18  Paul Eggert  <eggert@cs.ucla.edu>
 
+        Improve API of recently-added bool vector functions (Bug#15912).
+        The old API had (bool-vector-count-matches A B)
+        and (bool-vector-count-matches-at A B I), which gave the
+        misleading impression that the two functions were variants, one
+        with a location I.  The new API has (bool-vector-count-population A)
+        and (bool-vector-count-consecutive A B I) to make the distinction
+        clearer.  The first function no longer has a B argument, since the
+        caller can easily determine the number of nils if the length and
+        number of ts is known.
+        * data.c (Fbool_vector_count_population): Rename from
+        bool_vector_count_matches, and accept just 1 argument.
+        (Fbool_vector_count_consecutive): Rename from
+        Fbool_vector_count_matches_at.
+
         Always allocate at least one bits_word per bool vector.
         See Daniel Colascione in:
         http://lists.gnu.org/archive/html/emacs-devel/2013-11/msg00518.html