diff --git a/exp_scenario/module/gui/vlayer.lua b/exp_scenario/module/gui/vlayer.lua
index e51d7521..7ff088bb 100644
--- a/exp_scenario/module/gui/vlayer.lua
+++ b/exp_scenario/module/gui/vlayer.lua
@@ -110,6 +110,7 @@ Elements.stat_bar = Gui.define("vlayer/stat_bar")
 --- @class ExpGui_Vlayer.elements.stat_bar.display_data
 --- @field value number Fraction the bar is filled
 --- @field caption string
+--- @field tooltip string
 
 --- Refresh a bar
 --- @param stat_bar LuaGuiElement