diff --git a/tex/crepbook.cls b/tex/crepbook.cls
index d98557a5..bcbb4d9c 100644
--- a/tex/crepbook.cls
+++ b/tex/crepbook.cls
@@ -482,6 +482,9 @@
   \IfStrEq{\@lang}{english}{rythm}{}%
   \IfStrEq{\@lang}{french}{rythme}{}%
 }%
+\newcommand*{\Adlib}{%
+  \emph{ad~lib.}%
+}%
 
 \let\musicnoteORIG\musicnote
 \renewcommand{\musicnote}[2][]{%