cache ENOSYS on some optional functions

1 files changed, 1 insertions, 1 deletions

diff --git a/include/fuse.h b/include/fuse.h
index e3e4333..d298cb3 100644
--- a/include/fuse.h
+++ b/include/fuse.h
@@ -103,7 +103,7 @@ typedef int (*fuse_dirfil_t) (fuse_dirh_t h, const char *name, int type);
  *  then set the callback pointer to NULL.
  * 
  *  - fsync() has a boolean 'datasync' parameter which if TRUE then do
- *  an fdatasync() operation.  
+ *  an fdatasync() operation.  Implementing this call is optional.
  */
 struct fuse_operations {
     int (*getattr)     (const char *, struct stat *);