How to display hover message in left bar in vscode active text editor?

Question

I'm developing vscode extension and I want to achieve the same effect like 'Breakpoint' msg after mouse hovering: breakpoint hover msg in vscode

I tried few things and nothing gave me correct result. Now I have:

vscode.commands.registerTextEditorCommand('startextension', () => {
   let decorationsOptions : vscode.DecorationOptions[] =[];
   decorationsOptions.push({hoverMessage: 'Works', range: new vscode.Range(3, 0, 3, 0)});
   vscode.window.activeTextEditor.setDecorations(vscode.window.createTextEditorDecorationType({}), decorationsOptions);
});

Unfortunately after launching extension and hovering over selected line I get nothing. This solution works for example for displaying custom icon, but not for hovering.

Do I have to register special hover provider to see my "Works" msg?