diff --git a/share/man/man3/pthread_cond_timedwait.3 b/share/man/man3/pthread_cond_timedwait.3
index 46b195166284..49ad347a6f6a 100644
--- a/share/man/man3/pthread_cond_timedwait.3
+++ b/share/man/man3/pthread_cond_timedwait.3
@@ -46,7 +46,7 @@ The
 function atomically blocks the current thread waiting on the condition
 variable specified by
 .Fa cond ,
-and unblocks the mutex specified by
+and releases the mutex specified by
 .Fa mutex .
 The waiting thread unblocks only after another thread calls
 .Xr pthread_cond_signal 3 ,
@@ -78,6 +78,10 @@ is invalid.
 .It Bq Er ETIMEDOUT
 The system time has reached or exceeded the time specified in
 .Fa abstime .
+.It Bq Er EPERM
+The specified 
+.Fa mutex 
+was not locked by the calling thread.
 .El
 .Sh SEE ALSO
 .Xr pthread_cond_broadcast 3 ,
diff --git a/share/man/man3/pthread_cond_wait.3 b/share/man/man3/pthread_cond_wait.3
index 89e4bea2bc34..88b7233b16bb 100644
--- a/share/man/man3/pthread_cond_wait.3
+++ b/share/man/man3/pthread_cond_wait.3
@@ -72,6 +72,10 @@ The value specified by
 or the value specified by
 .Fa mutex
 is invalid.
+.It Bq Er EPERM
+The specified 
+.Fa mutex 
+was not locked by the calling thread.
 .El
 .Sh SEE ALSO
 .Xr pthread_cond_broadcast 3 ,