diff --git a/man7/vdso.7 b/man7/vdso.7
index 634118302..71336d7e8 100644
--- a/man7/vdso.7
+++ b/man7/vdso.7
@@ -441,9 +441,9 @@ __kernel_rt_sigreturn	LINUX_2.5
 __kernel_vsyscall	LINUX_2.5
 .\" Added in 7a59ed415f5b57469e22e41fc4188d5399e0b194 and updated
 .\" in 37c975545ec63320789962bf307f000f08fabd48.
-__vdso_clock_gettime	LINUX_2.6
-__vdso_gettimeofday	LINUX_2.6
-__vdso_time	LINUX_2.6
+__vdso_clock_gettime	LINUX_2.6 (exported since Linux 3.15)
+__vdso_gettimeofday	LINUX_2.6 (exported since Linux 3.15)
+__vdso_time	LINUX_2.6 (exported since Linux 3.15)
 .TE
 .if t \{\
 .in