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In the MWE below:

\documentclass{report}
\usepackage[left=2.5cm,right=2cm,top=2cm,bottom=2cm]{geometry}
\usepackage[T1]{fontenc}
\usepackage{tikz,pgf}


\usetikzlibrary{calc,trees,positioning,arrows,chains,shapes.geometric,%
    decorations.pathreplacing,decorations.pathmorphing,shapes,%
    matrix,shapes.symbols,automata}

\begin{document}

\begin{center}
\begin{tikzpicture}[->,>=stealth',shorten >=1pt,auto, node distance=3cm ,semithick]

    \node [draw,  rounded corners=2pt,rectangle, initial, initial text=\textbf{Query},initial where=above](timing) {Timing};
    \node [draw,  rounded corners=2pt,rectangle](indep)[right of=timing] {Independent};
    \node [draw,  rounded corners=2pt,rectangle](caching)[right of=indep] {Caching};
    \node [draw,  rounded corners=2pt,rectangle](pc)[right of=caching] {PC Logging};

    \node [draw, node distance=3cm, rounded corners=2pt,rectangle](stp)[right of= pc] {STP};

    \path (timing) edge[]   node{} (indep);

    \path (indep) edge[]   node{} (caching);

    \path (caching) edge[]   node{} (pc);

    \path (pc) edge[]   node{} (stp);

\end{tikzpicture}\\
\end{center}

\end{document}

How can I put a vertical arrow, that is pointing upwards, on the arrow (preferably at its mid point) between the PCLogging and STP boxes ?

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up vote 5 down vote accepted

Adding

\draw[->] ($(stp.west)!0.5!(pc.east)$) -- ++(0,1cm) node[above] {Text}; 

is sufficient to find the midpoint and adding text at the end.

enter image description here

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