diff --git a/src/Mod/Sketcher/Gui/CommandConstraints.cpp b/src/Mod/Sketcher/Gui/CommandConstraints.cpp
index 5b85d231c..8b137b1ac 100644
--- a/src/Mod/Sketcher/Gui/CommandConstraints.cpp
+++ b/src/Mod/Sketcher/Gui/CommandConstraints.cpp
@@ -5916,7 +5916,7 @@ CmdSketcherCompConstrainRadDia::CmdSketcherCompConstrainRadDia()
     sGroup          = QT_TR_NOOP("Sketcher");
     sMenuText       = QT_TR_NOOP("Constrain arc or circle");
     sToolTipText    = QT_TR_NOOP("Constrain an arc or a circle");
-    sWhatsThis      = "Sketcher_CompCreateCircle";
+    sWhatsThis      = "Sketcher_CompConstrainRadDia";
     sStatusTip      = sToolTipText;
     sAccel          = "SHIFT+R";
     eType           = ForEdit;