diff --git a/migrations/004.sql b/migrations/004.sql
new file mode 100644
index 0000000..65a73bb
--- /dev/null
+++ b/migrations/004.sql
@@ -0,0 +1,8 @@
+-- schema update 2021-02-16
+-- add a table for board-excluded channels
+CREATE TABLE board_exclusions (
+    channel_oid INTEGER PRIMARY KEY,
+    guild_oid INTEGER NOT NULL,
+    FOREIGN KEY (channel_oid) REFERENCES objects(oid),
+    FOREIGN KEY (channel_oid) REFERENCES objects(oid)
+);