diff --git a/manual/extension/setup_seadoc.md b/manual/extension/setup_seadoc.md
index 7fc778fe..b8d5c0f3 100644
--- a/manual/extension/setup_seadoc.md
+++ b/manual/extension/setup_seadoc.md
@@ -201,7 +201,7 @@ Placeholder spot for shared volumes. You may elect to store certain persistent i
 
 ## Database used by SeaDoc
 
-SeaDoc used one database table `seahub_db.sdoc_operation_log` to store operation logs. The database table is cleaned automatically.
+SeaDoc uses one database table `seahub_db.sdoc_operation_log` to store operation logs. The database table is cleaned automatically.
 
 ## Common issues when settings up SeaDoc