diff --git a/src/settings_type.h b/src/settings_type.h
--- a/src/settings_type.h
+++ b/src/settings_type.h
@@ -222,6 +222,8 @@ struct GUISettings {
 
 	bool   scale_bevels;                     ///< bevels are scaled with GUI scale.
 
+	std::string number_format; ///< formatting string for numbers (like "thousands" grouping)
+	std::string number_abbreviations; ///< mapping to number formats for different powers of ten/thresholds
 	std::string digit_decimal_separator; ///< decimal separator
 
 	/**