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We argue that the relativistic Unruh temperature cannot be associated withthe bits on the screen, in the form considered by Verlinde. The acceleration$a$ is a scalar quantity (the modulus of the acceleration four vecor) and not avector. When the mass $m$ approaches the holographic screen, viewed as astretched horizon, the shift $\Delta x$ from Verlinde's Eq. (3.15) becomes$c^{2}/a$ and the entropy variation equals $(1/2) k_{B} \Delta N$, inaccordance with Gao's calculations. Using the Heisenberg Principle we show thatthe energy on the causal horizon (viewed as a holographic screen) of aninertial observer is proportional to its radius, as for a black hole.

Comments on "On the Origin of Gravity and the Laws of Newton", by Erik Verlinde