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index 7d9d6ced..1f7769d3 100644
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+++ b/docs/source/usage/differences.rst
@@ -58,3 +58,13 @@ should return the same output for both.
Adding the ``+over`` flag to the projection definition provides
the old behaviour.
+
+Version 6.0.0
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+Removal of proj_def.dat
+-----------------------
+
+Before PROJ 6, the proj_def.dat was used to provide general and per-projection
+parameters, when +no_defs was not specified. It has now been removed. In
+particular, the +ellps=WGS84 is no longer a default.