diff --git a/man4/loop.4 b/man4/loop.4
index 6e955fba3..ba5aa24e7 100644
--- a/man4/loop.4
+++ b/man4/loop.4
@@ -155,12 +155,12 @@ This operation takes no argument.
 .TP
 .BR LOOP_SET_DIRECT_IO " (since Linux 4.10)"
 .\" commit ab1cb278bc7027663adbfb0b81404f8398437e11
-Set DIRECT IO mode on the loop device.
-So it can be used to open backing file.
+Set DIRECT I/O mode on the loop device, so that
+it can be used to open backing file.
 The (third)
 .BR ioctl (2)
 argument is an unsigned long value.
-non-zero represents direct IO mode.
+A non-zero represents direct I/O mode.
 .TP
 .BR LOOP_SET_BLOCK_SIZE " (since Linux 4.14)"
 .\" commit 89e4fdecb51cf5535867026274bc97de9480ade5
@@ -168,9 +168,11 @@ Set the block size of the loop device.
 The (third)
 .BR ioctl (2)
 argument is an unsigned long value.
-This value must be 2 to the power of N
-and in range [512,pagesize].
-Otherwise, it will get EINVAL error.
+This value must be a power of two in the range
+[512,pagesize];
+otherwise, an
+.B EINVAL
+error results.
 .PP
 Since Linux 2.6, there are two new
 .BR ioctl (2)