Mention the reference frame the fluid velocity is measured.

git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinBase/HydroBase/trunk@52 57fe0bb3-ccba-405f-9b23-de0201f165b7

1 files changed, 2 insertions, 1 deletions

diff --git a/doc/documentation.tex b/doc/documentation.tex
index 9be3134..67b8ce2 100644
--- a/doc/documentation.tex
+++ b/doc/documentation.tex
@@ -138,7 +138,8 @@ details):
  \item \verb|rho|: rest mass density $\varrho$
  \item \verb|press|: pressure $p$
  \item \verb|eps|: specific internal energy $\epsilon$
- \item \verb|vel[3]|: contravariant fluid three velocity $v^i$ defined as
+ \item \verb|vel[3]|: contravariant fluid three velocity $v^i$ with respect 
+to the Eulerian observer defined as
   \begin{equation}
       v^i = \frac{u^i}{\alpha u^0} + \frac{\beta^i}{\alpha}
   \end{equation}