1 files changed, 16 insertions, 9 deletions
diff --git a/NEWS b/NEWS
index 9086b7ed17..db1c28261e 100644
--- a/NEWS
+++ b/NEWS
@@ -9,15 +9,22 @@ Version 2.21
 
 * The following bugs are resolved with this release:
 
-  6652, 10672, 12847, 12926, 13862, 14132, 14138, 14171, 14498, 15215,
-  15884, 16009, 16191, 16469, 16617, 16619, 16657, 16740, 16857, 17192,
-  17266, 17273, 17344, 17363, 17370, 17371, 17411, 17460, 17475, 17485,
-  17501, 17506, 17508, 17522, 17555, 17570, 17571, 17572, 17573, 17574,
-  17582, 17583, 17584, 17585, 17589, 17594, 17601, 17608, 17616, 17625,
-  17630, 17633, 17634, 17635, 17647, 17653, 17657, 17658, 17664, 17665,
-  17668, 17682, 17717, 17719, 17722, 17723, 17724, 17725, 17732, 17733,
-  17744, 17745, 17746, 17747, 17748, 17775, 17777, 17780, 17781, 17782,
-  17791, 17793, 17796, 17797, 17803, 17806, 17834, 17844, 17848
+  6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
+  15215, 15884, 16009, 16191, 16469, 16617, 16619, 16657, 16740, 16857,
+  17192, 17266, 17273, 17344, 17363, 17370, 17371, 17411, 17460, 17475,
+  17485, 17501, 17506, 17508, 17522, 17555, 17570, 17571, 17572, 17573,
+  17574, 17582, 17583, 17584, 17585, 17589, 17594, 17601, 17608, 17616,
+  17625, 17630, 17633, 17634, 17635, 17647, 17653, 17657, 17658, 17664,
+  17665, 17668, 17682, 17717, 17719, 17722, 17723, 17724, 17725, 17732,
+  17733, 17744, 17745, 17746, 17747, 17748, 17775, 17777, 17780, 17781,
+  17782, 17791, 17793, 17796, 17797, 17803, 17806, 17834, 17844, 17848
+
+* A new semaphore algorithm has been implemented in generic C code for all
+  machines. Previous custom assembly implementations of semaphore were
+  difficult to reason about or ensure that they were safe. The new version
+  of semaphore supports machines with 64-bit or 32-bit atomic operations.
+  The new semaphore algorithm is used by sem_init, sem_open, sem_post,
+  sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
 
 * Port to Altera Nios II has been contributed by Mentor Graphics.