diff --git a/sql/v01/10.create.sql b/sql/v01/10.create.sql
index b9ec485..44dcf85 100644
--- a/sql/v01/10.create.sql
+++ b/sql/v01/10.create.sql
@@ -431,7 +431,7 @@ CREATE TABLE season (
 
 CREATE TABLE modifier (
     year         INTEGER NOT NULL,
-    modid        TEXT    NOT NULL CHECK (modid REGEXP '^[A-Z]+$'),
+    modid        TEXT    NOT NULL CHECK (modid REGEXP '^[A-Z0-9]+$'),
 
     name         TEXT    NOT NULL,
     abs          INTEGER,