diff --git a/man7/vdso.7 b/man7/vdso.7
index ef6bef5bd..39d6dc4ad 100644
--- a/man7/vdso.7
+++ b/man7/vdso.7
@@ -386,7 +386,9 @@ __kernel_sync_dicache_p5	LINUX_2.6.15
 .ft P
 \}
 .PP
-The
+In kernel versions before Linux 5.6,
+.\" commit 654abc69ef2e69712e6d4e8a6cb9292b97a4aa39
+the
 .B CLOCK_REALTIME_COARSE
 and
 .B CLOCK_MONOTONIC_COARSE
@@ -424,7 +426,9 @@ __kernel_sync_dicache_p5	LINUX_2.6.15
 .ft P
 \}
 .PP
-The
+In kernel versions before Linux 4.16,
+.\" commit 5c929885f1bb4b77f85b1769c49405a0e0f154a1
+the
 .B CLOCK_REALTIME_COARSE
 and
 .B CLOCK_MONOTONIC_COARSE