# y-axis units tikz

I have the following image in my file. How can I add units next to the numbers? I'd like the units to be in volts. I just added a part of the tikz code bellow.

\definecolor{mycolor1}{rgb}{0.00000,0.44700,0.74100}%
\begin{tikzpicture}

\begin{axis}[%
width=0.951\figurewidth,
height=\figureheight,
at={(0\figurewidth,0\figureheight)},
scale only axis,
xmin=1,
xmax=1250,
xtick={\empty},
ymin=4,
ymax=6,
axis background/.style={fill=white},
xmajorgrids,
ymajorgrids,
y unit = \volt
]
table[row sep=crcr]{%
1   5\\
2   4.90000000000009\\
3   5\\
5   5\\
};
\end{axis}
\end{tikzpicture}%

• Please make your code compilable (if possible), or at least complete it with \documentclass{...}, the required \usepackage's, \begin{document}, and \end{document}. That may seem tedious to you, but think of the extra work it represents for TeX.SX users willing to give you a hand. Help them help you: remove that one hurdle between you and a solution to your problem. – Moriambar May 15 '17 at 16:23
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If you really want the unit in every tick (I would prefer an axis label stating the units, but let's not dispute tastes...), the best option is using siunitx:

\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usepackage{pgfplots}\pgfplotsset{compat=1.13}
\usepackage{siunitx}
\begin{document}
\begin{tikzpicture}[
]
\begin{axis}[%
xmin=1,
xmax=5,
xtick={\empty},
ymin=4,
ymax=6,
axis background/.style={fill=white},
yticklabel={\SI[round-mode=places, round-precision=1]{\tick}{V}}
]
table[row sep=crcr]{%
1   4.1\\
2   4.9\\
3   5\\
5   5.6\\
};
\end{axis}
\end{tikzpicture}
\end{document}


This is explained in section 4.15 of the pgfplots manual, "Ticks Options".

(BTW, this is an example of a Minimal Working Example --- MWE. USe it on your next question! )

(PS, thanks to @Ulrike Fiecher, see siunitx in pgfplots label description infinite loop?)