diff --git a/include/zh_pcf8574.h b/include/zh_pcf8574.h
index 8340735..2ccdde9 100644
--- a/include/zh_pcf8574.h
+++ b/include/zh_pcf8574.h
@@ -64,6 +64,7 @@ extern "C"
         i2c_master_bus_handle_t i2c_handle; // Unique I2C bus handle.
         i2c_master_dev_handle_t dev_handle; // Unique I2C device handle.
 #endif
+        uint8_t system; // System variable for use in another components.
     } zh_pcf8574_handle_t;
 
     ESP_EVENT_DECLARE_BASE(ZH_PCF8574);
diff --git a/version.txt b/version.txt
index afaf360..1cc5f65 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-1.0.0
\ No newline at end of file
+1.1.0
\ No newline at end of file