diff --git a/lib/data/monorepo.json b/lib/data/monorepo.json
index a246f36cde6eb6..b92b69048722ea 100644
--- a/lib/data/monorepo.json
+++ b/lib/data/monorepo.json
@@ -268,6 +268,7 @@
     "dropwizard": "https://github.com/dropwizard/dropwizard",
     "duende-identityserver": "https://github.com/DuendeSoftware/IdentityServer",
     "elastic-apm-agent-rum-js": "https://github.com/elastic/apm-agent-rum-js",
+    "elastic-ecs-dotnet": "https://github.com/elastic/ecs-dotnet",
     "electron-forge": [
       "https://github.com/electron-userland/electron-forge",
       "https://github.com/electron/forge"