% arara: pdflatex % arara: makeglossaries % arara: pdflatex \documentclass{article} \usepackage[colorlinks]{hyperref} \usepackage[prefix]{glossaries-extra} \makeglossaries \newabbreviation [prefix={an\space}, prefixfirst={a~}] {svm}{SVM}{support vector machine} \begin{document} \tableofcontents \section{\Pglsfmtlong{svm}} This is a sample document to test prefixes. First use: \pgls{svm}. Next use: \pgls{svm}. \printglossaries \end{document}