diff --git a/docs/archive-changelog.rst b/docs/archive-changelog.rst
--- a/docs/archive-changelog.rst
+++ b/docs/archive-changelog.rst
@@ -14,6 +14,11 @@
 2021
 ----
 
+* **2021-09-22** Completed first archival of the gitlab instance
+  https://foss.heptapod.net repositories. This is the first forge with mostly mercurial
+  origins. Regular crawling for those repositories is enabled (tracking: `T3581
+  <https://forge.softwareheritage.org/T3581>`__)
+
 * **2021-08-03** Completed first archival of SourceForge Mercurial repositories; regular
   crawling for those repositories enabled (tracking: `T3374
   <https://forge.softwareheritage.org/T3374>`__)