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diff --git a/lib/libc/sys/clock_gettime.2 b/lib/libc/sys/clock_gettime.2
--- a/lib/libc/sys/clock_gettime.2
+++ b/lib/libc/sys/clock_gettime.2
@@ -29,7 +29,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd May 13, 2021
+.Dd July 1, 2021
.Dt CLOCK_GETTIME 2
.Os
.Sh NAME
@@ -68,14 +68,17 @@
.It Dv CLOCK_REALTIME
.It Dv CLOCK_REALTIME_PRECISE
.It Dv CLOCK_REALTIME_FAST
+.It Dv CLOCK_REALTIME_COARSE
Increments as a wall clock should.
.It Dv CLOCK_MONOTONIC
.It Dv CLOCK_MONOTONIC_PRECISE
.It Dv CLOCK_MONOTONIC_FAST
+.It Dv CLOCK_MONOTONIC_COARSE
Increments in SI seconds.
.It Dv CLOCK_UPTIME
.It Dv CLOCK_UPTIME_PRECISE
.It Dv CLOCK_UPTIME_FAST
+.It Dv CLOCK_BOOTTIME
Starts at zero when the kernel boots and increments
monotonically in SI seconds while the machine is running.
.It Dv CLOCK_VIRTUAL
@@ -104,6 +107,16 @@
.Fa CLOCK_UPTIME_PRECISE
are used to get the most exact value as possible, at the expense of
execution time.
+The clock IDs
+.Fa CLOCK_REALTIME_COARSE ,
+.Fa CLOCK_MONOTONIC_COARSE
+are aliases of corresponding IDs with _FAST suffix for compatibility with other
+systems.
+Finally,
+.Dv CLOCK_BOOTTIME
+is an alias for
+.Dv CLOCK_UPTIME
+for compatibility with other systems.
.Pp
The structure pointed to by
.Fa tp
diff --git a/sys/sys/_clock_id.h b/sys/sys/_clock_id.h
--- a/sys/sys/_clock_id.h
+++ b/sys/sys/_clock_id.h
@@ -85,6 +85,15 @@
#define CLOCK_PROCESS_CPUTIME_ID 15
#endif /* __POSIX_VISIBLE >= 199309 */
+/*
+ * Linux compatible names.
+ */
+#if __BSD_VISIBLE
+#define CLOCK_BOOTTIME CLOCK_UPTIME
+#define CLOCK_REALTIME_COARSE CLOCK_REALTIME_FAST
+#define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC_FAST
+#endif
+
#if __BSD_VISIBLE
#define TIMER_RELTIME 0x0 /* relative timer */
#endif

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