diff --git a/HISTORY.rst b/HISTORY.rst
index 5cef298c0..8d0878d26 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -3,7 +3,7 @@
 5.6.6
 =====
 
-XXXX-XX-XX
+2019-11-25
 
 **Bug fixes**
 
diff --git a/docs/index.rst b/docs/index.rst
index 74a4c36e0..aac153aad 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -2635,6 +2635,10 @@ take a look at the `development guide`_.
 Timeline
 ========
 
+- 2019-11-25:
+  `5.6.6 <https://pypi.org/project/psutil/5.6.6/#files>`__ -
+  `what's new <https://github.com/giampaolo/psutil/blob/master/HISTORY.rst#566>`__ -
+  `diff <https://github.com/giampaolo/psutil/compare/release-5.6.5...release-5.6.6#files_bucket>`__
 - 2019-11-06:
   `5.6.5 <https://pypi.org/project/psutil/5.6.5/#files>`__ -
   `what's new <https://github.com/giampaolo/psutil/blob/master/HISTORY.rst#565>`__ -