diff --git a/src/database/schema.sql b/src/database/schema.sql
index 20509bd..2c5dde1 100644
--- a/src/database/schema.sql
+++ b/src/database/schema.sql
@@ -11,6 +11,7 @@ CREATE TABLE IF NOT EXISTS groups (
 CREATE TABLE IF NOT EXISTS tasks (
   id INTEGER PRIMARY KEY AUTOINCREMENT,
   description TEXT NOT NULL,
+  created_by TEXT NOT NULL, -- WhatsApp phone number of task creator
   assigned_to TEXT NOT NULL DEFAULT '', -- WhatsApp phone number (empty string if unassigned)
   due_date TEXT, -- ISO 8601 date string (e.g., "2023-10-31")
   completed BOOLEAN NOT NULL DEFAULT FALSE,
diff --git a/src/services/taskService.ts b/src/services/taskService.ts
index 9ec8a23..eb32b63 100644
--- a/src/services/taskService.ts
+++ b/src/services/taskService.ts
@@ -11,8 +11,8 @@ export function createTask(sender: string, params: CreateTaskParams) {
   }
 
   const result = execute(
-    'INSERT INTO tasks (description, assigned_to, due_date, completed) VALUES (?, ?, ?, ?)',
-    [params.description.trim(), params.assignedTo || null, params.dueDate || null, false]
+    'INSERT INTO tasks (description, created_by, assigned_to, due_date, completed) VALUES (?, ?, ?, ?, ?)',
+    [params.description.trim(), sender, params.assignedTo || null, params.dueDate || null, false]
   );
 
   const task = getTaskById(result.lastInsertRowid);