diff --git a/README.md b/README.md
index 342da70..3931b21 100644
--- a/README.md
+++ b/README.md
@@ -106,7 +106,7 @@ prealloc		Preallocate space for files excessively when file size is
 			increasing on writes. Decreases fragmentation in case of
 			parallel write operations to different files.
 
-no_acs_rules		"No access rules" mount option sets access rights for
+(no)acsrules		"No access rules" mount option sets access rights for
 			files/folders to 777 and owner/group to root. This mount
 			option absorbs all other permissions:
 			- permissions change for files/folders will be reported
diff --git a/docs/ntfs3.rst b/docs/ntfs3.rst
index fb29067..3e383b6 100644
--- a/docs/ntfs3.rst
+++ b/docs/ntfs3.rst
@@ -73,7 +73,7 @@ prealloc		Preallocate space for files excessively when file size is
 			increasing on writes. Decreases fragmentation in case of
 			parallel write operations to different files.
 
-no_acs_rules		"No access rules" mount option sets access rights for
+(no)acsrules		"No access rules" mount option sets access rights for
 			files/folders to 777 and owner/group to root. This mount
 			option absorbs all other permissions:
 			- permissions change for files/folders will be reported