diff --git a/Doc/libthread.tex b/Doc/libthread.tex
index 24ebac5..dabfe70 100644
--- a/Doc/libthread.tex
+++ b/Doc/libthread.tex
@@ -25,7 +25,7 @@
 Raised on thread-specific errors.
 \end{excdesc}
 
-\begin{funcdesc}{start_new_thread}{func\, arg}
+\begin{funcdesc}{start_new_thread}{func, arg}
 Start a new thread.  The thread executes the function \var{func}
 with the argument list \var{arg} (which must be a tuple).  When the
 function returns, the thread silently exits.  When the function