tweak fs.h spacing; add comment

41948359 · rsc · cd12eea3 · 41948359
--- a/fs.h
+++ b/fs.h
@@ -46,6 +46,8 @@ struct dinode {
 // Block containing bit for block b
 #define BBLOCK(b, ninodes) (b/BPB + (ninodes)/IPB + 3)

+// PAGEBREAK: 10
+// Directory is a file containing a sequence of dirent structures.
 #define DIRSIZ 14

 struct dirent {