diff --git a/docbook/release-notes.asciidoc b/docbook/release-notes.asciidoc
index 9c1cb552f0..5c9f458157 100644
--- a/docbook/release-notes.asciidoc
+++ b/docbook/release-notes.asciidoc
@@ -42,6 +42,7 @@ since version 2.6.0:
 * The membership operator now supports ranges, allowing display filters such as
   `tcp.port in {4430..4434}` to be expressed. See the User's Guide, chapter
   _Building display filter expressions_ for details.
+* The autotools build system has been removed. CMake is the one build system now.
 * tshark has now "-G elastic-mapping" option to generate an ElasticSearch mapping file.
 
 //=== Removed Dissectors