diff --git a/Doc/lib/libfuncs.tex b/Doc/lib/libfuncs.tex
index cd1486506d3..63a73b1476f 100644
--- a/Doc/lib/libfuncs.tex
+++ b/Doc/lib/libfuncs.tex
@@ -755,6 +755,7 @@ class C:
 
 \begin{verbatim}
 class C(object):
+    def __init__(self): self.__x = None
     def getx(self): return self.__x
     def setx(self, value): self.__x = value
     def delx(self): del self.__x