diff --git a/Documentation/ch-swapfile.rst b/Documentation/ch-swapfile.rst
index 7717d680..2c20104b 100644
--- a/Documentation/ch-swapfile.rst
+++ b/Documentation/ch-swapfile.rst
@@ -16,7 +16,11 @@ The limitations come namely from the COW-based design and mapping layer of
 blocks that allows the advanced features like relocation and multi-device
 filesystems. However, the swap subsystem expects simpler mapping and no
 background changes of the file block location once they've been assigned to
-swap.
+swap. The constraints mentioned above (single device and single profile) are
+related to the swapfile itself, i.e. the extents and their placement. It is
+possible to create swapfile on multi-device filesystem as long as the extents
+are on one device but this cannot be affected by user and depends on free space
+fragmentation and available unused space for new chunks.
 
 With active swapfiles, the following whole-filesystem operations will skip
 swapfile extents or may fail: