diff --git a/doc/btrbk.conf.5.asciidoc b/doc/btrbk.conf.5.asciidoc
index cb5b567..a9c8e7d 100644
--- a/doc/btrbk.conf.5.asciidoc
+++ b/doc/btrbk.conf.5.asciidoc
@@ -49,11 +49,10 @@ SECTIONS
 --------
 
 *volume* <volume-directory>|<url>::
-	Directory of a btrfs volume containing the source subvolume(s)
-	to be backed up. '<volume-directory>' must be an absolute path
-	and point to a btrfs volume (or subvolume). Usually the mount
-	point of a btrfs filesystem mounted with the 'subvolid=5'
-	option.
+    Directory of a btrfs volume containing the source subvolume(s) to
+    be backed up. '<volume-directory>' must be an absolute path and
+    point to a btrfs volume (or subvolume). Usually the mount point of
+    a btrfs filesystem mounted with the 'subvolid=5' option.
 
 *subvolume* <subvolume-name>::
     Subvolume to be backed up, relative to the '<volume-directory>'