diff --git a/man2/semop.2 b/man2/semop.2
index 357132c75..9c5482f82 100644
--- a/man2/semop.2
+++ b/man2/semop.2
@@ -459,10 +459,22 @@ call:
 .B SEMOPM
 Maximum number of operations allowed for one
 .BR semop ()
-call (32)
-(on Linux, this limit can be read and modified via the third field of
-.IR /proc/sys/kernel/sem ).
+call.
+Before Linux 3.19,
+.\" commit e843e7d2c88b7db107a86bd2c7145dc715c058f4
+the default value for this limit was 32.
+Since Linux 3.19, the default value is 500.
+On Linux, this limit can be read and modified via the third field of
+.IR /proc/sys/kernel/sem .
 .\" This /proc file is not available in Linux 2.2 and earlier -- MTK
+.IR Note :
+this limit should not be raised above 1000,
+.\" See comment in Linux 3.19 source file include/uapi/linux/sem.h
+because of the risk of that
+.BR semop (2)
+fails due to kernel memory fragmentation when allocating memory to copy the
+.IR sops
+array.
 .TP
 .B SEMVMX
 Maximum allowable value for