diff --git a/pep-0418.txt b/pep-0418.txt
index c8623f839..5faf18cb0 100644
--- a/pep-0418.txt
+++ b/pep-0418.txt
@@ -660,6 +660,7 @@ gethrtime                  1 ns        No               Yes            Yes
 CLOCK_HIGHRES              1 ns        No               Yes            ?
 CLOCK_MONOTONIC            1 ns        Slewed on Linux  Yes            No
 CLOCK_MONOTONIC_RAW        1 ns        No               Yes            No
+CLOCK_BOOTTIME             1 ns        ?                Yes            Yes
 mach_absolute_time()       1 ns        No               Yes            No
 QueryPerformanceCounter()  \-          No               Yes            ?
 GetTickCount[64]()         1 ms        No               Yes            Yes