diff --git a/docs/releases/v2.13.0.md b/docs/releases/v2.13.0.md
index 415537c22be8f967c66af2346513514b03330348..da2c2728ad5abc795bd876ba33f8c7840526f88b 100644
--- a/docs/releases/v2.13.0.md
+++ b/docs/releases/v2.13.0.md
@@ -7,3 +7,7 @@
 - disable surface face selection (until it becomes fully supported)
 - allow feature to be downloaded
 - main download button also downloads selected feature
+
+## Behind the scene
+
+- ported the backend to use python rather than nodejs
diff --git a/mkdocs.yml b/mkdocs.yml
index 3ff6048f486849482bca9b326b24a851d34e7921..53929148e28204116e11ed1b9c8ed13fcf23304e 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -33,6 +33,7 @@ nav:
     - Fetching datasets: 'advanced/datasets.md'
     - Display non-atlas volumes: 'advanced/otherVolumes.md'
   - Release notes:
+    - v2.13.0: 'releases/v2.13.0.md'
     - v2.12.5: 'releases/v2.12.5.md'
     - v2.12.4: 'releases/v2.12.4.md'
     - v2.12.3: 'releases/v2.12.3.md'