diff --git a/README.md b/README.md
index 1f4c98a..7b1c821 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,21 @@ ppmMethano = Sensor1.readPPM();
 
 You'll need Arduino desftop app 1.8.9 or later.
 
+### Sensor manufacter:
+| Sensor | Manufacter | URL Datasheet |
+| MQ-2 | Pololulu | [datasheet](https://www.pololu.com/file/0J309/MQ2.pdf) |
+| MQ-3 | Sparkfun | [datasheet](https://www.sparkfun.com/datasheets/Sensors/MQ-3.pdf) |
+| MQ-4 | Sparkfun | [datasheet](https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-4.pdf) |
+| MQ-5 | parallax | [datasheet](https://www.parallax.com/sites/default/files/downloads/605-00009-MQ-5-Datasheet.pdf) |
+| MQ-6 | Sparkfun | [datasheet](https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-6.pdf) |
+| MQ-7 | Sparkfun | [datasheet](https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-7.pdf) |
+| MQ-8 | Sparkfun | [datasheet](https://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/Biometric/MQ-8.pdf) |
+| MQ-9 | haoyuelectronics | [datasheet](http://www.haoyuelectronics.com/Attachment/MQ-9/MQ9.pdf) |
+| MQ-131 | sensorsportal | [datasheet](http://www.sensorsportal.com/DOWNLOADS/MQ131.pdf) |
+| MQ-135 | HANWEI Electronics | [datasheet](https://www.electronicoscaldas.com/datasheet/MQ-135_Hanwei.pdf) |
+| MQ-303A | HANWEI Electronics | [datasheet](http://www.kosmodrom.com.ua/pdf/MQ303A.pdf) |
+| MQ-309A | HANWEI Electronics | [datasheet](http://www.sensorica.ru/pdf/MQ-309A.pdf) |
+
 ### Installing
 
 Clone this repositry into your desktop machine