diff --git a/docs/changelog.md b/docs/changelog.md
index dba12ebad..08de53693 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -65,7 +65,9 @@ SPDX-FileCopyrightText: 2011-2020 Carles Fernandez-Prades <carles.fernandez@cttc
 - Fixed the `obsdiff` and `rinex2assist` utilities when installed if they were
   built with a locally downloaded version of GPSTk.
 - Improved rendering of equations in HTML documentation generated by Doxygen.
-  Make use of MathJax 2.x if found.
+  Make use of MathJax for equation rendering. Added new building option
+  `ENABLE_EXTERNAL_MATHJAX`, set to `ON` by default. If set to `OFF`, it allows
+  using a local installation of MathJax 2.
 
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