* Mention our convention degree(0) == 0.

diff --git a/doc/tutorial/ginac.texi b/doc/tutorial/ginac.texi
index eaae40afd3eb0038f6e56b62a57732c2637e5146..323c6eb218ad665a987b006296a864bc209793ce 100644 (file)
--- a/doc/tutorial/ginac.texi
+++ b/doc/tutorial/ginac.texi
@@ -4182,8 +4182,9 @@ int ex::ldegree(const ex & s);
 @end example
 
 which also work reliably on non-expanded input polynomials (they even work
-on rational functions, returning the asymptotic degree). To extract
-a coefficient with a certain power from an expanded polynomial you use
+on rational functions, returning the asymptotic degree). By definition, the
+degree of zero is zero. To extract a coefficient with a certain power from
+an expanded polynomial you use
 
 @example
 ex ex::coeff(const ex & s, int n);