diff --git a/hwmon.hpp b/hwmon.hpp
index 6ae1885..cc24266 100644
--- a/hwmon.hpp
+++ b/hwmon.hpp
@@ -9,10 +9,17 @@
 static constexpr auto cinput = "input";
 static constexpr auto clabel = "label";
 static constexpr auto ctarget = "target";
+static constexpr auto cenable = "enable";
 
 static const std::string input = cinput;
 static const std::string label = clabel;
 static const std::string target = ctarget;
+static const std::string enable = cenable;
+}
+
+namespace enable
+{
+static const auto rpmMode = 2;
 }
 
 namespace type
@@ -23,6 +30,8 @@
 static constexpr auto ccurr = "current";
 static constexpr auto cenergy = "energy";
 static constexpr auto cpower = "power";
+static constexpr auto cpwm = "pwm";
+
 
 static const std::string fan = cfan;
 static const std::string temp = ctemp;
@@ -30,6 +39,7 @@
 static const std::string curr = ccurr;
 static const std::string energy = cenergy;
 static const std::string power = cpower;
+static const std::string pwm = cpwm;
 }
 }