# subsubsection description and title not separated

When I have \subsubsection{sub sub section} Some Contents and some description for it. I cannot distinguish between the title and description as they appear in the same line.

For instance if I do:

\documentclass[prodmode,acmtecs]{acmsmall}

\usepackage[ruled]{algorithm2e}
\usepackage{array}
\renewcommand{\algorithmcfname}{ALGORITHM}
\SetAlFnt{\small}
\SetAlCapFnt{\small}
\SetAlCapNameFnt{\small}
\SetAlCapHSkip{0pt}
\IncMargin{-\parindent}

\begin{document}

\section{First Section}
This is the first section.
\subsection{Sub Section}
This is the sub section.
\subsubsection{Sub Sub Section}

This is the sub sub section.

\end{document}


Then the output is like:

*Sub Sub Section*: This is the sub sub section.


This is how the acm template works like. I tried with article and it was okay.

What I would like to have is:

Sub Sub Section:
This is the sub sub section.


Can anyone help me with this?

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The acmsmall class is meant for submissions to ACM journals. You should stick to their style, if your paper is to be submitted. – egreg Jun 16 '12 at 22:44

\subsubsection in acmsmall is defined as

\def\subsubsection{\@startsection{subsubsection}{3}{10pt}%
{-.5\baselineskip \@plus -2\p@ \@minus -.2\p@}%
{-3.5\p@}{\subsubsectionfont}}


If you modify the -3.5\p@ and make it positive (3.5\p@), there is a line break between the title and the following text. The indent is still set at 10pt, which you might want to change though.

Here's a complete minimal example showing the suggested change:

\documentclass[prodmode,acmtecs]{acmsmall}
\makeatletter
\def\subsubsection{\@startsection{subsubsection}{3}{10pt}%
{-.5\baselineskip \@plus -2\p@ \@minus -.2\p@}%
{3.5\p@}{\subsubsectionfont}}
\makeatother
\begin{document}

\section{First Section}
This is the first section.
\subsection{Sub Section}
This is the sub section.
\subsubsection{Sub Sub Section}

This is the sub sub section.

\end{document}

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