diff --git a/sql/database-migrate.txt b/sql/database-migrate.txt
index 194e671fda35b43b3c523f4f290c803f87acd4ef..d93cf85eac903e7b683b3446e100041e5ac2a211 100644
--- a/sql/database-migrate.txt
+++ b/sql/database-migrate.txt
@@ -4147,7 +4147,8 @@ last_net_act,last_cpu_act,last_ext_act);
 
 	alter table experiment_resources add 
            `input_data_idx` int(10) unsigned default NULL after archive_tag;
-
+	alter table experiment_resources add
+	    KEY `inputdata` (`input_data_idx`);
 
 	And then run this script: