diff --git a/sql/v01/13.create.payment.sql b/sql/v01/13.create.payment.sql
index 18533fe..2f0dc4c 100644
--- a/sql/v01/13.create.payment.sql
+++ b/sql/v01/13.create.payment.sql
@@ -151,11 +151,15 @@ CREATE TABLE payment_member (
 
 -- all values in the table are stored with precision 2!
 CREATE TABLE payment_custom (
-    year    INTEGER NOT NULL,
-    mgnr    INTEGER NOT NULL,
+    year        INTEGER NOT NULL,
+    mgnr        INTEGER NOT NULL,
 
-    amount  INTEGER NOT NULL,
-    comment TEXT,
+    mod_abs     INTEGER DEFAULT NULL,
+    mod_rel     REAL    DEFAULT NULL,
+    mod_comment TEXT    DEFAULT NULL,
+
+    amount      INTEGER DEFAULT NULL,
+    comment     TEXT    DEFAULT NULL,
 
     CONSTRAINT pk_payment_custom PRIMARY KEY (year, mgnr),
     CONSTRAINT fk_payment_custom_season FOREIGN KEY (year) REFERENCES season (year)
diff --git a/sql/v01/99.schema_version.sql b/sql/v01/99.schema_version.sql
index 1443832..47e2ecc 100644
--- a/sql/v01/99.schema_version.sql
+++ b/sql/v01/99.schema_version.sql
@@ -1,3 +1,3 @@
 
 -- This value MUST NOT be changed while other connections are open!
-PRAGMA schema_version = 2700;
+PRAGMA schema_version = 2800;