diff --git a/doc/man/s3fs.1 b/doc/man/s3fs.1
index 0412d58..49a1bc8 100644
--- a/doc/man/s3fs.1
+++ b/doc/man/s3fs.1
@@ -220,10 +220,8 @@ But if you set the allow_other with this option, you can control permissions of
 \fB\-o\fR nomultipart - disable multipart uploads
 .TP
 \fB\-o\fR enable_content_md5 ( default is disable )
-verifying uploaded data without multipart by content-md5 header.
-Enable to send "Content-MD5" header when uploading a object without multipart posting.
-If this option is enabled, it has some influences on a performance of s3fs when uploading small object.
-Because s3fs always checks MD5 when uploading large object, this option does not affect on large object.
+Allow S3 server to check data integrity of uploads via the Content-MD5 header.
+This can add CPU overhead to transfers.
 .TP
 \fB\-o\fR ecs ( default is disable )
 This option instructs s3fs to query the ECS container credential metadata address instead of the instance metadata address.
diff --git a/src/s3fs_util.cpp b/src/s3fs_util.cpp
index aef556d..d7e6f19 100644
--- a/src/s3fs_util.cpp
+++ b/src/s3fs_util.cpp
@@ -1231,7 +1231,8 @@ void show_help (void)
     "   nomultipart (disable multipart uploads)\n"
     "\n"
     "   enable_content_md5 (default is disable)\n"
-    "      - ensure data integrity during writes with MD5 hash.\n"
+    "      Allow S3 server to check data integrity of uploads via the\n"
+    "      Content-MD5 header.  This can add CPU overhead to transfers.\n"
     "\n"
     "   ecs\n"
     "      - This option instructs s3fs to query the ECS container credential\n"