1 files changed, 1 insertions, 0 deletions
diff --git a/helpers.h b/helpers.h
index 80dc00167..c9e70532d 100644
--- a/helpers.h
+++ b/helpers.h
@@ -16,6 +16,7 @@ QString get_depth_string(int mm, bool showunit = false, bool showdecimal = true)
 QString get_depth_unit();
 QString get_weight_string(weight_t weight, bool showunit = false);
 QString get_weight_unit();
+QString get_cylinder_used_gas_string(cylinder_t *cyl, bool showunit = false);
 QString get_temperature_string(temperature_t temp, bool showunit = false);
 QString get_temp_unit();
 QString get_volume_string(volume_t volume, bool showunit = false);