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-rw-r--r--manual/threads.texi2
1 files changed, 2 insertions, 0 deletions
diff --git a/manual/threads.texi b/manual/threads.texi
index 5bcfe32d6a..06b6b277a1 100644
--- a/manual/threads.texi
+++ b/manual/threads.texi
@@ -842,6 +842,8 @@ will wait forever in the same way as @code{pthread_join}.
 @safety{@prelim{}@mtsafe{}@asunsafe{@asulock{}}@acunsafe{@aculock{}}}
 Behaves like @code{pthread_timedjoin_np} except that the absolute time in
 @var{abstime} is measured against the clock specified by @var{clockid}.
+Currently, @var{clockid} must be either @code{CLOCK_MONOTONIC} or
+@code{CLOCK_REALTIME}.
 @end deftypefun
 
 @node Single-Threaded