diff --git a/README.md b/README.md
index cc1fb44..bb5e500 100644
--- a/README.md
+++ b/README.md
@@ -24,3 +24,12 @@ flush privileges;
 update* user set password=PASSWORD('test!23') where user='alex'; 
 flush privileges;
 ```
+
+### Insertar y si existe update
+```sql
+INSERT INTO table (id, name, age) VALUES(1, "A", 19) ON DUPLICATE KEY UPDATE    
+name="A", age=19
+```
+```sql
+INSERT INTO Clientes(Num, Nombre, Telefono) VALUES(1,'Agustin','123456') ON DUPLICATE KEY UPDATE Telefono = VALUES(Telefono);
+```
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