UI: add useful information to 'Measure' tooltip

release/scripts/startup/bl_ui/space_toolsystem_toolbar.py

@@ -192,6 +192,14 @@ class _defs_view3d_generic:
     def ruler():
         return dict(
             text="Measure",
+            description=(
+                "Measure distance and angles.\n"
+                "\u2022 Drag anywhere for new measurement.\n"
+                "\u2022 Drag ruler segment to measure an angle.\n"
+                "\u2022 Drag ruler outside the view to remove.\n"
+                "\u2022 Ctrl to snap.\n"
+                "\u2022 Shift to measure surface thickness"
+            ),
             icon="ops.view3d.ruler",
             widget="VIEW3D_GGT_ruler",
             keymap=(