diff --git a/data/core.yaml b/data/core.yaml
index e94fbb51d..8eba17daf 100644
--- a/data/core.yaml
+++ b/data/core.yaml
@@ -100,6 +100,7 @@ en:
       too_large: This can't be made circular because not enough of it is currently visible.
       connected_to_hidden: This can't be made circular because it is connected to a hidden feature.
       not_downloaded: This can't be made circular because parts of it have not yet been downloaded.
+      already_circular: This can't be made circular because it's already circular.
     orthogonalize:
       title: Square
       description: