1 files changed, 6 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-class-bdi b/Documentation/ABI/testing/sysfs-class-bdi
index b800cdda40bb..b9e8a9368dc6 100644
--- a/Documentation/ABI/testing/sysfs-class-bdi
+++ b/Documentation/ABI/testing/sysfs-class-bdi
@@ -44,3 +44,9 @@ bdi_dirty_kb (read-only)
         Current threshold on this BDI for reclaimable + writeback
         memory
 
+min_ratio (read-write)
+
+        Minimal percentage of global dirty threshold allocated to this
+        bdi.  If the value written to this file would make the the sum
+        of all min_ratio values exceed 100, then EINVAL is returned.
+        The default is zero