Add line about migrating from the old indexing API to the new one.

J535D165 · Jun 21, 2017 · 2b4d1ac · 2b4d1ac
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diff --git a/README.rst b/README.rst
@@ -50,6 +50,9 @@ are returned.
     block_class = recordlinkage.BlockIndex('surname')
     candidate_links = block_class.index(df_a, df_b)
 
+**Older versions of Python Record Linkage Toolkit use a different syntax for
+indexing.** `More info about migrating is found here.<#migrating>`_
+
 For each candidate link, compare the records with one of the
 comparison or similarity algorithms in the Compare class.