/**
* @brief Set a constant for use when building styles
*
- * A constant is used in JSON files e.g. "my-image":"{ROOT_PATH}/mypath/image.jpg"
+ * A constant is used in JSON files e.g. "myImage":"{ROOT_PATH}/mypath/image.jpg"
* where the string "{ROOT_PATH}" is substituted with the value.
*
* @param[in] key The key of the constant