diff --git a/src/corelib/io/qstorageinfo.cpp b/src/corelib/io/qstorageinfo.cpp
index 25b11103b9..2a12c2cd85 100644
--- a/src/corelib/io/qstorageinfo.cpp
+++ b/src/corelib/io/qstorageinfo.cpp
@@ -241,9 +241,10 @@ QByteArray QStorageInfo::device() const
     Returns the subvolume name for this volume.
 
     Some filesystem types allow multiple subvolumes inside one device, which
-    may be mounted in different paths. If the subvolume could be detected, it
-    is returned here. The format of the subvolume name is specific to each
-    filesystem type.
+    may be mounted in different paths (e.g. 'bind' mounts on Unix, or Btrfs
+    filesystem subvolumes). If the subvolume could be detected, its name is
+    returned by this function. The format of the subvolume name is specific
+    to each filesystem type.
 
     If this volume was not mounted from a subvolume of a larger filesystem or
     if the subvolume could not be detected, this function returns an empty byte