small note in origin store

src/origin/store.rs

@@ -362,6 +362,9 @@ pub mod git {
 
                             let descr_file_path = self.descr_file_path(descr_id.as_ref());
 
+                            // TODO it's possible that opening the file will fail if syncing is
+                            // still ongoing, as writing the descr file is the last step after
+                            // initial sync has succeeded.
                             let descr_file = fs::File::open(descr_file_path)
                                 .map_err(|e| store::AllDescrsError::Unexpected(Box::from(e)))?;