diff --git a/docs/apps/duffy/index.md b/docs/apps/duffy/index.md
new file mode 100644
index 0000000..d5cd941
--- /dev/null
+++ b/docs/apps/duffy/index.md
@@ -0,0 +1 @@
+Duffy is the middle layer running ci.centos.org that manages the provisioning, maintenance and teardown / rebuild of the Nodes (physical hardware for now, VMs coming soon) that are used to run the tests in the CI Cluster.
diff --git a/mkdocs.yml b/mkdocs.yml
index 03c5dbf..78a9b6a 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -47,7 +47,7 @@ nav:
          - Onboarding sysadmins: operations/ci/onboarding_sysadmin.md
          - Outage Preparation: operations/ci/outage_preparation.md
          - Replacing Certs: operations/ci/replacing_certs.md
-         - Upgrades: 
+         - Upgrades:
            - operations/ci/upgrades/upgrade-notification-template.md
            - operations/ci/upgrades/upgrade-jenkins.md
 
@@ -80,6 +80,7 @@ nav:
       - apps/mailman.md
       - apps/docs.md
       - apps/blog.md
+      - apps/duffy/index.md
   - Infra services:
       - infra/authentication.md
       - infra/dns.md