Convective motion and Stellar jitter

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Jamipat
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Page 26 of http://www.maths.qmul.ac.uk/~rpn/ASTM735/Week7.pdf claims that stellar jitter can be caused by the convective motions in the stellar photosphere.

Can someone explain that to me as I don't understand it?
 
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Convective motion can cause the photosphere to have currents that move up and down. Since the radial velocity detection methods relies on doppler shift to detect motions in the parent star due to orbiting planets, these currents can introduce noise and uncertainty in the measure of the amount of doppler shift, as the light from that area of the photosphere can be blue or red shifted differently than the rest of the star.