diff --git a/example-world.md b/example-world.md
index 7805cf8..533ff39 100644
--- a/example-world.md
+++ b/example-world.md
@@ -754,16 +754,22 @@ with the filesystem.
length in bytes of the pathname contained in the symbolic link.
-data-access-timestamp
: datetime
+data-access-timestamp
: option<datetime
>
Last data access timestamp.
+
If the option
is none, the platform doesn't maintain an access
+timestamp for this file.
-data-modification-timestamp
: datetime
+data-modification-timestamp
: option<datetime
>
Last data modification timestamp.
+
If the option
is none, the platform doesn't maintain a
+modification timestamp for this file.
-status-change-timestamp
: datetime
-Last file status change timestamp.
+
status-change-timestamp
: option<datetime
>
+Last file status-change timestamp.
+
If the option
is none, the platform doesn't maintain a
+status-change timestamp for this file.
diff --git a/wit/types.wit b/wit/types.wit
index 9b1412d..c7e817d 100644
--- a/wit/types.wit
+++ b/wit/types.wit
@@ -107,11 +107,20 @@ interface types {
/// length in bytes of the pathname contained in the symbolic link.
size: filesize,
/// Last data access timestamp.
- data-access-timestamp: datetime,
+ ///
+ /// If the `option` is none, the platform doesn't maintain an access
+ /// timestamp for this file.
+ data-access-timestamp: option,
/// Last data modification timestamp.
- data-modification-timestamp: datetime,
- /// Last file status change timestamp.
- status-change-timestamp: datetime,
+ ///
+ /// If the `option` is none, the platform doesn't maintain a
+ /// modification timestamp for this file.
+ data-modification-timestamp: option,
+ /// Last file status-change timestamp.
+ ///
+ /// If the `option` is none, the platform doesn't maintain a
+ /// status-change timestamp for this file.
+ status-change-timestamp: option,
}
/// Flags determining the method of how paths are resolved.