diff --git a/man2/userfaultfd.2 b/man2/userfaultfd.2
index 44af3e480..a6c482766 100644
--- a/man2/userfaultfd.2
+++ b/man2/userfaultfd.2
@@ -244,13 +244,13 @@ The following values can appear in the
 field:
 .RS
 .TP
-.B UFFD_EVENT_PAGEFAULT
+.BR UFFD_EVENT_PAGEFAULT " (since Linux 4.3)"
 A page-fault event.
 The page-fault details are available in the
 .I pagefault
 field.
 .TP
-.B UFFD_EVENT_FORK
+.BR UFFD_EVENT_FORK " (since Linux 4.11)"
 Generated when the faulting process invokes
 .BR fork (2)
 system call.
@@ -259,7 +259,7 @@ The event details are available in the
 field.
 .\" FIXME descirbe duplication of userfault file descriptor during fork
 .TP
-.B UFFD_EVENT_REMAP
+.BR UFFD_EVENT_REMAP " (since Linux 4.11)"
 Generated when the faulting process invokes
 .BR mremap (2)
 system call.
@@ -267,7 +267,7 @@ The event details are available in the
 .I remap
 field.
 .TP
-.B UFFD_EVENT_REMOVE
+.BR UFFD_EVENT_REMOVE " (since Linux 4.11)"
 Generated when the faulting process invokes
 .BR madvise (2)
 system call with
@@ -279,7 +279,7 @@ The event details are available in the
 .I remove
 field.
 .TP
-.B UFFD_EVENT_UNMAP
+.BR UFFD_EVENT_UNMAP " (since Linux 4.11)"
 Generated when the faulting process unmaps a memory range,
 either explicitly using
 .BR munmap (2)