diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt
index a920935..a37f391 100644
--- a/Documentation/filesystems/f2fs.txt
+++ b/Documentation/filesystems/f2fs.txt
@@ -167,9 +167,11 @@
 
  reclaim_segments             This parameter controls the number of prefree
                               segments to be reclaimed. If the number of prefree
-			      segments is larger than this number, f2fs tries to
-			      conduct checkpoint to reclaim the prefree segments
-			      to free segments. By default, 100 segments, 200MB.
+			      segments is larger than the number of segments
+			      in the proportion to the percentage over total
+			      volume size, f2fs tries to conduct checkpoint to
+			      reclaim the prefree segments to free segments.
+			      By default, 5% over total # of segments.
 
  ipu_policy                   This parameter controls the policy of in-place
                               updates in f2fs. There are five policies: