diff --git a/src/sys/NOTES.md b/src/sys/NOTES.md
index 78ba1e3..ec56a6d 100644
--- a/src/sys/NOTES.md
+++ b/src/sys/NOTES.md
@@ -41,7 +41,7 @@ inode format
             01  world write
    i.dskps      7 block numbers (all indirect blocks if "large file")
    i.uid        owner
-   i.nlks       link count
+   i.nlks       link count (negative)
    i.size       size (in words?)
    i.uniq       unique value assigned at creation
 ```