diff --git a/include/fuse-lite/fuse.h b/include/fuse-lite/fuse.h
index 08d317da..8ea787a0 100644
--- a/include/fuse-lite/fuse.h
+++ b/include/fuse-lite/fuse.h
@@ -125,7 +125,8 @@ struct fuse_operations {
     /** File open operation
      *
      * No creation, or truncation flags (O_CREAT, O_EXCL, O_TRUNC)
-     * will be passed to open().  Open should check if the operation
+     * will be passed to open().  Unless the 'default_permissions'
+     * mount option is given, open should check if the operation
      * is permitted for the given flags.  Optionally open may also
      * return an arbitrary filehandle in the fuse_file_info structure,
      * which will be passed to all file operations.