  This paper is an addendum to our earlier paper \cite{pom} where we computed
the Pomeron contribution to $p ~ p$ and $p ~ \bar p$ scattering in AdS/QCD. The
model of \cite{pom} depends on four parameters: the slope and intercept of the
Pomeron trajectory $\alpha'_c, \alpha_c(0)$, a mass scale $M_d$ which
determines a form factor entering into matrix elements of the energy-momentum
tensor, and a coupling $\lambda_{\cal P}$ between the lightest spin $2$
glueball and the proton which sets the overall scale of the total cross
section. Here we perform a more detailed computation of $\lambda_{\cal P}$ in
the Sakai-Sugimoto model using the construction of nucleons as instantons of
the dual 5d gauge theory and an effective 5d fermion description of these
nucleons which has been successfully used to compute a variety of nucleon-meson
couplings. We find $\lambda_{\cal P,{\rm SS}} \simeq 6.38 ~ {\rm GeV}^{-1}$
which is in reasonable agreement with the value $\lambda_{{\cal P},{\rm fit}} =
8.28 ~ {\rm GeV}^{-1}$ determined by fitting single Pomeron exchange to data.
