diff --git a/Doc/library/math.rst b/Doc/library/math.rst
index 3d297363056..594ee92ce4e 100644
--- a/Doc/library/math.rst
+++ b/Doc/library/math.rst
@@ -123,8 +123,8 @@ Number-theoretic and representation functions:
 
 .. function:: modf(x)
 
-   Return the fractional and integer parts of *x*.  Both results carry the sign of
-   *x*, and both are floats.
+   Return the fractional and integer parts of *x*.  Both results carry the sign
+   of *x*, and both are floats.  The integer part is returned as a real.
 
 
 .. function:: trunc(x)