diff --git a/apps/ailbl-users_email_insert-get.py b/apps/ailbl-users_email_insert-get.py
index 98bc650..e7b784a 100644
--- a/apps/ailbl-users_email_insert-get.py
+++ b/apps/ailbl-users_email_insert-get.py
@@ -89,6 +89,7 @@ def main():
 
 
 def user_insert_email():
+    # 1. Lấy user_id từ header (identity.id Kratos)
     user_id = request.headers.get("X-UserId")
     if not user_id:
         return jsonify({"errorCode": "USER_ID_REQUIRED"}), 400, CORS_HEADERS
@@ -97,7 +98,7 @@ def user_insert_email():
         if not data:
             return jsonify({"errorCode": "NO_DATA_PROVIDED"}), 400, CORS_HEADERS
 
-        parsed = UserEmailRequest(**data) # parsed luu du lieu gi ? 
+        parsed = UserEmailRequest(**data) # parsed(object) luu du lieu validate body ma data gui len la 1 dict
     except ValidationError as e:
         return jsonify({"errorCode": "VALIDATION_ERROR", "details": e.errors()}), 422, CORS_HEADERS
     except Exception as e:
@@ -106,7 +107,7 @@ def user_insert_email():
     try:
         add_email, status_code, headers = crud.add_email_to_user(
             user_id, parsed.email)
-        if parsed.is_primary:
+        if parsed.is_primary: # Neu parsed la nick email chinh
             # update email kratos
             identity = kratos.get_identity(user_id)
             traits = identity.traits
@@ -135,7 +136,7 @@ def user_filter_emails():
     try:
         conn = init_db_connection()
         with conn.cursor() as cursor:
-            records = __filter_email(cursor, paging, user_id) # Xu ly gi day ?
+            records = __filter_email(cursor, paging, user_id) # Xu ly gi day ? goi ham _filter_email
 
             return jsonify(
                 records,
diff --git a/apps/crud.py b/apps/crud.py
index ae1fdf1..a28fbf0 100644
--- a/apps/crud.py
+++ b/apps/crud.py
@@ -168,13 +168,13 @@ def add_email_to_user(user_id: str, email: str):  # Add email
         with conn.cursor() as cursor:
             cursor.execute("""
                 SELECT user_id FROM ailbl_user_email WHERE email = %s;
-            """, (email,))
-            existing = cursor.fetchone()
-            if existing:
+            """, (email,)) # Truy van ra ket qua email 
+            existing = cursor.fetchone() # Tao ra bien existing save email duoc add
+            if existing: 
                 return {"errorCode": "EMAIL_ALREADY_EXISTS"}, 409, CORS_HEADERS
 
-            id = str(uuid_lib.uuid4())
-            provider = auto_detect_provider(email)
+            id = str(uuid_lib.uuid4()) 
+            provider = auto_detect_provider(email) # Ham xu li lay phan sau cua @
             cursor.execute("""
                 INSERT INTO ailbl_user_email (id, user_id, email, provider, created, modified)
                 VALUES (%s, %s, %s, %s, now(), now())
diff --git a/apps/schemas.py b/apps/schemas.py
index 8d730bb..5fe5948 100644
--- a/apps/schemas.py
+++ b/apps/schemas.py
@@ -3,7 +3,7 @@ from typing import Optional
 
 # Validate dau vao email 
 
-class UserEmailRequest(BaseModel):
+class UserEmailRequest(BaseModel): #Pased luu gia tri validate email
     email: EmailStr = Field(..., description="Email address")
     provider: Optional[str] = Field(None, description="Email service provider")
     is_primary: Optional[bool] = Field(None, description= "is primary email ")