diff --git a/src/db.ts b/src/db.ts
index 18486ff..4eb24b2 100644
--- a/src/db.ts
+++ b/src/db.ts
@@ -36,6 +36,8 @@ let updateSessionStatsStmt: ReturnType<Database["prepare"]>;
 function runMigrations(): void {
   // Add Phase 2.3 session state and stats columns
   const migrations = [
+    // Phase 2.1: Rich prompt support
+    "ALTER TABLE prompts ADD COLUMN prompt_json TEXT",
     // Stats columns
     "ALTER TABLE sessions ADD COLUMN state TEXT DEFAULT 'ready'",
     "ALTER TABLE sessions ADD COLUMN prompts INTEGER DEFAULT 0",