diff --git a/nominatim/cli.py b/nominatim/cli.py
index 83d79a68..8d4071db 100644
--- a/nominatim/cli.py
+++ b/nominatim/cli.py
@@ -306,7 +306,7 @@ class UpdateIndex:
 
 class UpdateRefresh:
     """\
-    Recompute auxillary data used by the indexing process.
+    Recompute auxiliary data used by the indexing process.
 
     These functions must not be run in parallel with other update commands.
     """