Is this OK?

diff --git a/src/algebra/integer.spad b/src/algebra/integer.spad
index 423b30c..1e1e561 100644
--- a/src/algebra/integer.spad
+++ b/src/algebra/integer.spad
@@ -193,8 +193,8 @@
 ++ Keywords: integer
 ++ Description: \spadtype{NonNegativeInteger} provides functions for non
 ++   negative integers.
-NonNegativeInteger : Join(OrderedAbelianMonoidSup, SemiRing,
-                         CommutativeStar) with
+NonNegativeInteger : Join(OrderedAbelianMonoidSup, SemiRing, 
CommutativeStar,
+                          ConvertibleTo InputForm) with
             _quo : (%, %) -> %
               ++ a quo b returns the quotient of \spad{a} and b, forgetting
               ++ the remainder.
@@ -237,7 +237,8 @@
 ++ Keywords: positive integer
 ++ Description: \spadtype{PositiveInteger} provides functions for
 ++   positive integers.
-PositiveInteger : Join(OrderedAbelianSemiGroup, Monoid, CommutativeStar) 
with
+PositiveInteger : Join(OrderedAbelianSemiGroup, Monoid, CommutativeStar,
+                       ConvertibleTo InputForm) with
             gcd : (%, %) -> %
               ++ gcd(a, b) computes the greatest common divisor of two
               ++ positive integers \spad{a} and b.

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