diff --git a/control/json/utils/modifier.hpp b/control/json/utils/modifier.hpp
index 3f59246..6153279 100644
--- a/control/json/utils/modifier.hpp
+++ b/control/json/utils/modifier.hpp
@@ -42,6 +42,7 @@
  *
  * The valid operators are:
  *  - "minus"
+ *  - "less_than"
  *
  * To add a new operator, derive a new class from BaseOperator and
  * then create it accordingly in setOperator.
@@ -103,13 +104,6 @@
      */
     void setOperator(const json& jsonObj);
 
-    /**
-     * @brief Subtracts _value from value
-     *
-     * @param[in] value - The value to subtract from
-     */
-    PropertyVariantType minus(const PropertyVariantType& value);
-
     /** @brief The value used by the operator */
     PropertyVariantType _value;