diff --git a/doc/whats-new.rst b/doc/whats-new.rst
index 3e5fae81..7177bddf 100644
--- a/doc/whats-new.rst
+++ b/doc/whats-new.rst
@@ -3,9 +3,10 @@
 What's New
 ----------
 
-v0.5.2 (unreleased)
-===================
+v0.5.2 (May 11, 2021)
+=====================
 
+- Add some explicit support for CMIP6 output. By `Deepak Cherian`_.
 - Replace the ``dims`` argument of :py:meth:`Dataset.cf.add_bounds` with ``keys``, allowing to use CF keys. By `Mattia Almansi`_.
 - Added :py:attr:`DataArray.cf.formula_terms` and :py:attr:`Dataset.cf.formula_terms`.
   By `Deepak Cherian`_.