diff --git a/CHANGELOG.md b/CHANGELOG.md
index e6a20b4..c691d69 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.10.0] - 2026-01-10
+
+### Changed (BREAKING)
+
+- `CommandHandler::on_startup()` now receives `pid: u32` as second parameter
+
 ## [0.9.0] - 2025-12-29
 
 ### Changed (BREAKING)
diff --git a/Cargo.toml b/Cargo.toml
index edc5d07..f043077 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "daemon-cli"
-version = "0.9.0"
+version = "0.10.0"
 edition = "2024"
 
 [dependencies]
diff --git a/src/lib.rs b/src/lib.rs
index 71afc56..4098519 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -421,10 +421,10 @@ where
 
     /// Called once when the daemon starts, before accepting connections.
     ///
-    /// Override this method to log the startup reason or perform
+    /// Override this method to log the startup reason and PID, or perform
     /// initialization that depends on whether this is a fresh start
     /// or a restart.
     ///
     /// The default implementation does nothing.
-    fn on_startup(&self, _reason: StartupReason) {}
+    fn on_startup(&self, _reason: StartupReason, _pid: u32) {}
 }
diff --git a/src/server.rs b/src/server.rs
index c0c81b7..4f77742 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -228,8 +228,8 @@ where
             "Daemon started and listening"
         );
 
-        // Notify handler of startup reason
-        self.handler.on_startup(self.startup_reason);
+        // Notify handler of startup reason and PID
+        self.handler.on_startup(self.startup_reason, pid);
 
         loop {
             // Select between accepting connection and shutdown signal