diff --git a/Doc/lib/libsys.tex b/Doc/lib/libsys.tex
index ceced16..8d66c76 100644
--- a/Doc/lib/libsys.tex
+++ b/Doc/lib/libsys.tex
@@ -479,9 +479,9 @@
   Activate dumping of VM measurements using the Pentium timestamp
   counter, if \var{on_flag} is true. Deactivate these dumps if
   \var{on_flag} is off. The function is available only if Python
-  was compiled with \code{--with-tsc}. To understand the output
-  of this dump, read \code{Python/ceval.c}.
-
+  was compiled with \longprogramopt{with-tsc}. To understand the
+  output of this dump, read \file{Python/ceval.c} in the Python
+  sources.
   \versionadded{2.4}
 \end{funcdesc}