diff --git a/gui/CLASSPlotElement.hxx b/gui/CLASSPlotElement.hxx
index 9d56c35fec7e430f4fd7f9a00163e32f67dde636..7b019651fb96a6b2e11909d0b4381ff6968bf59c 100644
--- a/gui/CLASSPlotElement.hxx
+++ b/gui/CLASSPlotElement.hxx
@@ -35,7 +35,7 @@ class CLASSPlotElement
 			// 0 Inventory
 			// 1 CumulativeIN
 			// 2 CulumativeOUT
-			// 3 Ratio of mass if selected ZAI(s) over Total Mass of Actinides
+			// 3 Ratio of mass of selected ZAI(s) over Total Mass of Actinides
 
 	int fFacilityNumber;	// Id of Facility
 				// For General :