diff --git a/docs/community-builder.md b/docs/community-builder.md
index 5c88abc..d7826c1 100644
--- a/docs/community-builder.md
+++ b/docs/community-builder.md
@@ -12,6 +12,8 @@ build-box.nix-community.org ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIElIQ54qAy7Dh63r
 darwin-build-box.nix-community.org ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKX7W1ztzAtVXT+NBMITU+JLXcIE5HTEOd7Q3fQNu80S
 ```
 
+[_Note: currently the darwin build box doesn't support FIDO keys._](https://github.com/nix-community/infra/issues/1007)
+
 ### Access
 
 We will grant access to well known members of the community, and people well known members in the community trust.
diff --git a/modules/darwin/community-builder/users.nix b/modules/darwin/community-builder/users.nix
index b17af3f..7861fd9 100644
--- a/modules/darwin/community-builder/users.nix
+++ b/modules/darwin/community-builder/users.nix
@@ -2,6 +2,9 @@ let
   # To add yourself:
   # 1. Add an entry to this list, using the next UID.
   # 2. Create a file in `keys` named your user name that contains your SSH key(s), separated by newlines.
+
+  # Note: currently the darwin build box doesn't support FIDO keys.
+  # https://github.com/nix-community/infra/issues/1007
   users = [
     {
       name = "winter";