eso-pic colorgrid overwriting pdfpages page

this may be really obvious but I'm trying to use pdfpages to annotate a pdf "form". To help with filling it in, I'm trying to put a grid on the page.

The following code places a grid on the page but it covers the pdf so I cant see what I'm trying to fill.

What am I doing wrong? (MWE with \includepdf ..somepdf replaced with any pdf file/page)

\documentclass[10pt]{article}
\usepackage{grffile}
\usepackage[colorgrid,texcoord,gridunit=pt]{eso-pic}
\usepackage{pdfpages}

\begin{document}

\includepdf[pages=1-1]{"/home/me/somepdf"}

\end{document}

-

Use

\usepackage[grid,
gridcolor=red!20,
subgridcolor=green!20,
%texcoord,
gridunit=pt]{eso-pic}


Code:

\documentclass[10pt]{article}
\usepackage{grffile}
\usepackage[grid,
gridcolor=red!20,
subgridcolor=green!20,
%texcoord,
gridunit=pt]{eso-pic}
\usepackage{pdfpages}

\begin{document}
\includepdf[pages=-]{snifs_fov}
\end{document}


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thanks @HarishKumar. As ever your answer works perfectly, and as ever, I'm not quite sure why it works. Appreciate the help. – Tahnoon Pasha Jan 22 '13 at 6:02