diff --git a/man3/grantpt.3 b/man3/grantpt.3
index 0052aacf5..34c59a52b 100644
--- a/man3/grantpt.3
+++ b/man3/grantpt.3
@@ -31,7 +31,7 @@ Glibc 2.23 and earlier:
 The
 .BR grantpt ()
 function changes the mode and owner of the slave pseudoterminal device
-corresponding to the master pseudoterminal referred to by
+corresponding to the master pseudoterminal referred to by the file descriptor
 .IR fd .
 The user ID of the slave is set to the real UID of the calling process.
 The group ID is set to an unspecified value (e.g.,