diff --git a/src/notify/mod.rs b/src/notify/mod.rs
index 8b9725a..0b4e489 100644
--- a/src/notify/mod.rs
+++ b/src/notify/mod.rs
@@ -349,11 +349,11 @@ pub enum NotifyState<'a> {
     /// Tell the service manager to execute the configured watchdog option.
     WatchdogTrigger,
     /// Reset watchdog timeout value during runtime.
-    /// The value is in milliseconds.
-    WatchdogUsec(types::Milliseconds),
+    /// The value is in microseconds.
+    WatchdogUsec(types::Microseconds),
     /// Tells the service manager to extend the startup, runtime or shutdown service timeout corresponding the current state.
-    /// The value is in milliseconds.
-    ExtendTimeoutUsec(types::Milliseconds),
+    /// The value is in microseconds.
+    ExtendTimeoutUsec(types::Microseconds),
 }
 
 impl<'a> Display for NotifyState<'a> {
diff --git a/src/notify/types.rs b/src/notify/types.rs
index 1f27680..f8fb474 100644
--- a/src/notify/types.rs
+++ b/src/notify/types.rs
@@ -86,22 +86,23 @@ impl Display for StatusLine<'_> {
     }
 }
 
+/// Semantic type representing a number of microseconds.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct Milliseconds(u64);
+pub struct Microseconds(u64);
 
-impl From<u64> for Milliseconds {
+impl From<u64> for Microseconds {
     fn from(value: u64) -> Self {
         Self(value)
     }
 }
 
-impl From<Milliseconds> for u64 {
-    fn from(value: Milliseconds) -> Self {
+impl From<Microseconds> for u64 {
+    fn from(value: Microseconds) -> Self {
         value.0
     }
 }
 
-impl Display for Milliseconds {
+impl Display for Microseconds {
     #[inline]
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         Display::fmt(&self.0, f)