diff --git a/htdocs/install/mysql/migration/18.0.0-19.0.0.sql b/htdocs/install/mysql/migration/18.0.0-19.0.0.sql
index 4575e1d4f63..6b7ccbb6790 100644
--- a/htdocs/install/mysql/migration/18.0.0-19.0.0.sql
+++ b/htdocs/install/mysql/migration/18.0.0-19.0.0.sql
@@ -91,6 +91,8 @@ ALTER TABLE llx_prelevement_demande ADD INDEX idx_prelevement_demande_ext_paymen
 
 ALTER TABLE llx_actioncomm ADD COLUMN fk_bookcal_availability integer DEFAULT NULL;
 
+ALTER TABLE llx_actioncomm ADD INDEX idx_actioncomm_entity (entity);
+
 ALTER TABLE llx_product_lot ADD COLUMN qc_frequency integer DEFAULT NULL;
 ALTER TABLE llx_product_lot ADD COLUMN lifetime integer DEFAULT NULL;
 
diff --git a/htdocs/install/mysql/tables/llx_actioncomm.key.sql b/htdocs/install/mysql/tables/llx_actioncomm.key.sql
index 3859f90c78d..452a81dbf21 100644
--- a/htdocs/install/mysql/tables/llx_actioncomm.key.sql
+++ b/htdocs/install/mysql/tables/llx_actioncomm.key.sql
@@ -30,3 +30,5 @@ ALTER TABLE llx_actioncomm ADD INDEX idx_actioncomm_ref_ext (ref_ext);
 ALTER TABLE llx_actioncomm ADD INDEX idx_actioncomm_percent (percent);
 
 ALTER TABLE llx_actioncomm ADD INDEX idx_actioncomm_ref (ref, entity);
+-- To test performance to get fast next num on actioncomm
+-- ALTER TABLE llx_actioncomm ADD INDEX idx_actioncomm_entity_id (entity, id);