diff --git a/man3/unlockpt.3 b/man3/unlockpt.3
index 78f3199cd..26333ef6d 100644
--- a/man3/unlockpt.3
+++ b/man3/unlockpt.3
@@ -33,7 +33,7 @@ Glibc 2.23 and earlier:
 The
 .BR unlockpt ()
 function unlocks 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 .
 .PP
 .BR unlockpt ()