diff --git a/src/Mod/Sketcher/Gui/CommandConstraints.cpp b/src/Mod/Sketcher/Gui/CommandConstraints.cpp
index c3bfcea3b4..09bc3e9bd0 100644
--- a/src/Mod/Sketcher/Gui/CommandConstraints.cpp
+++ b/src/Mod/Sketcher/Gui/CommandConstraints.cpp
@@ -5281,7 +5281,7 @@ CmdSketcherConstrainRadiam::CmdSketcherConstrainRadiam()
     sAppModule      = "Sketcher";
     sGroup          = "Sketcher";
     sMenuText       = QT_TR_NOOP("Constrain auto radius/diameter");
-    sToolTipText    = QT_TR_NOOP("Fix automatically diameter on circle and radius on arc/pole");
+    sToolTipText    = QT_TR_NOOP("Fix the diameter if a circle is chosen, or the radius if an arc/spline pole is chosen");
     sWhatsThis      = "Sketcher_ConstrainRadiam";
     sStatusTip      = sToolTipText;
     sPixmap         = "Constraint_Radiam";