--- a/doc/interpreter/contrib.txi
+++ b/doc/interpreter/contrib.txi
@@ -306,5 +306,17 @@
 
 The M4 macro language is mainly used for autoconf configuration files. You should
 follow normal M4 rules when contributing to these files. Some M4 files come
-from external source, namely the Autoconf archive @url{http://autoconf-archive.cryp.to}.
+from external source, namely the Autoconf archive
+@url{http://autoconf-archive.cryp.to}.
 
+If you give a code example in the documentation written in texinfo with the 
+@code{@@example} environment, you should be aware that the text within such an 
+environment will not be wrapped. It is recommended that you keep the lines
+short enough to fit on pages in the generated pdf or ps documents. Here is a 
+ruler (in an @code{@@example} environment) for finding the appropriate line 
+width:
+
+@example
+         1         2         3         4         5         6         7         8
+12345678901234567890123456789012345678901234567890123456789012345678901234567890
+@end example