diff --git a/buildscript/constants.toml b/buildscript/constants.toml
index 6a1e1e6..450c1a0 100644
--- a/buildscript/constants.toml
+++ b/buildscript/constants.toml
@@ -75,6 +75,12 @@ strings = "ppq"
 value = "1e-15"
 unit = true
 
+[[constant]]
+enum_name = "WH"
+strings = "Wh"
+value = "W * hour"
+unit = true
+
 [[constant]]
 enum_name = "KWH"
 strings = "kWh"