diff --git a/hwmon.hpp b/hwmon.hpp
index 2202df0..6ae1885 100644
--- a/hwmon.hpp
+++ b/hwmon.hpp
@@ -8,9 +8,11 @@
 {
 static constexpr auto cinput = "input";
 static constexpr auto clabel = "label";
+static constexpr auto ctarget = "target";
 
 static const std::string input = cinput;
 static const std::string label = clabel;
+static const std::string target = ctarget;
 }
 
 namespace type