diff --git a/CHANGES.rst b/CHANGES.rst
index 22bf66730..ae7704882 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -20,7 +20,11 @@ development at the same time, such as 4.5.x and 5.0.
 Unreleased
 ----------
 
-Nothing yet.
+- Fix a problem with Cython code measurement (`pull 1347`_, fixing `issue
+  972`_).  Thanks, Matus Valo.
+
+.. _pull 1347: https://github.com/nedbat/coveragepy/pull/1347
+.. _issue 972: https://github.com/nedbat/coveragepy/issues/972
 
 
 .. _changes_6-4-2:
diff --git a/CONTRIBUTORS.txt b/CONTRIBUTORS.txt
index 2e4ed85b3..2dde5f4a4 100644
--- a/CONTRIBUTORS.txt
+++ b/CONTRIBUTORS.txt
@@ -107,6 +107,7 @@ Martin Fuzzey
 Matt Bachmann
 Matthew Boehm
 Matthew Desmarais
+Matus Valo
 Max Linke
 Michał Bultrowicz
 Mickie Betz