Update 4 4 vertical vector field

4-4-vertical-vector-field.md

@@ -29,7 +29,7 @@ On _Vector Cross-section_ menu category of _Menu Bar_, you can select one of the
 * Wind barbs : show distribution using wind barbs
 * Streamlines : show distribution using streamlines (optionally with animation)
 
-Each menu button has drop-down submenu, where you can set various options for each visualization style. In particular, streamline style supports animation of the flow, and you can choose animation style as well. For example, in streamline style you can choose _'glow'_ effect and start animation, so that wind flow is visualized using nice and intuitive animation with colored dots that are moving at different velocities.
+Each menu button has drop-down submenu, where you can set various options for each visualization style. In particular, streamline style supports animation of the flow, and you can choose animation style as well. Clicking the Streamline menu button starts/pauses the animation. For example, you can choose _'glow'_ effect in streamline style, so that wind flow is visualized using nice and intuitive animation with colored glowing dots moving at different velocities.
 
 ##### 4. Change the settings for color mapping (optional).