Protect '&' signs with '\' in description of PyNumber_Coerce.
diff --git a/Doc/extref.tex b/Doc/extref.tex
index 75485c6..d93eb16 100644
--- a/Doc/extref.tex
+++ b/Doc/extref.tex
@@ -366,7 +366,7 @@
reference counts), and return 0.
If no conversion is possible, or if some other error occurs,
return -1 (failure) and don't increment the reference counts.
- The call \code{PyNumber_Coerce(&o1, &o2)} is equivalent to the Python
+ The call \code{PyNumber_Coerce(\&o1, \&o2)} is equivalent to the Python
statement \code{o1, o2 = coerce(o1, o2)}.
\end{cfuncdesc}