diff --git a/TPMS-Cars.md b/TPMS-Cars.md
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--- a/TPMS-Cars.md
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@@ -1,3 +1,3 @@
-Tire Presure Monitoring Systems(TPMS) operate in the ISM Licence free bands. In USA and most of the world they use 318mHz, in Europe the frequency is 433.92mHz. The App at this time,decodes data from [Schrader TPMS sensors.](https://www.schradertpms.com), and this seem a common standard used in the automotive industry.
+[Tire Pressure Monitoring System (TPMS)](https://en.wikipedia.org/wiki/Tire-pressure_monitoring_system) operate in the ISM Licence free bands. In USA and most of the world they use 315mHz, in Europe the frequency is 433.92mHz. The App at this time,decodes data from [Schrader TPMS sensors.](https://www.schradertpms.com), and this seem a common standard used in the automotive industry.