diff --git a/projects/khora/ROADMAP.md b/projects/khora/ROADMAP.md
index 19648d31..cf01555f 100644
--- a/projects/khora/ROADMAP.md
+++ b/projects/khora/ROADMAP.md
@@ -9,8 +9,8 @@ The order reflects engineering dependencies rather than product priority.
    refresh, and zoom shortcuts.
 3. **Session persistence — done.** Remember the selected view, zoom, sidebar
    width, collapsed accounts, and visible calendars across restarts.
-4. **Filesystem monitoring** — refresh when local vdir files change, without
-   requiring the toolbar refresh button.
+4. **Filesystem monitoring — done.** Refresh when local vdir files change,
+   without requiring the toolbar refresh button.
 5. **Forward agenda** — replace the selected-day list with a lazily loaded,
    continuously scrolling agenda starting at the selected date.
 6. **Overlapping event layout** — place simultaneous timed events in adjacent
diff --git a/projects/khora/khora/khal_adapter.py b/projects/khora/khora/khal_adapter.py
index de98807a..17bb3096 100644
--- a/projects/khora/khora/khal_adapter.py
+++ b/projects/khora/khora/khal_adapter.py
@@ -29,6 +29,15 @@ class KhalRepository:
             if settings.get("type", "calendar") == "calendar"
         )
 
+    @property
+    def watch_paths(self) -> tuple[Path, ...]:
+        paths = {
+            Path(settings["path"]).expanduser()
+            for settings in self._config["calendars"].values()
+            if settings.get("type", "calendar") == "calendar"
+        }
+        return tuple(sorted(paths))
+
     def events_on(self, day: dt.date, visible: set[str] | None = None) -> tuple[Event, ...]:
         return self.events_for_days((day,), visible)[day]
 
diff --git a/projects/khora/khora/window.py b/projects/khora/khora/window.py
index fb44f18f..9abd6126 100644
--- a/projects/khora/khora/window.py
+++ b/projects/khora/khora/window.py
@@ -35,6 +35,8 @@ class KhoraWindow(Adw.ApplicationWindow):
         self._state_store = state_store or StateStore()
         self._state = self._state_store.load()
         self._save_source = 0
+        self._refresh_source = 0
+        self._file_monitors: list[Gio.FileMonitor] = []
         self._visible_calendars: set[str] = set()
         self._collapsed_accounts = set(self._state.collapsed_accounts)
         self._view_mode = (
@@ -87,6 +89,7 @@ class KhoraWindow(Adw.ApplicationWindow):
         self._split.connect("notify::position", lambda *_: self._schedule_state_save())
         self._toolbar.set_content(self._split)
         self._refresh()
+        self._install_file_monitors()
         self._clock_source = GLib.timeout_add_seconds(30, self._on_clock_tick)
         self.connect("close-request", self._on_close_request)
 
@@ -224,6 +227,29 @@ class KhoraWindow(Adw.ApplicationWindow):
         overlay.add_overlay(self._empty)
         return overlay
 
+    def _install_file_monitors(self) -> None:
+        assert self._repository is not None
+        for path in getattr(self._repository, "watch_paths", ()):
+            try:
+                monitor = Gio.File.new_for_path(str(path)).monitor_directory(
+                    Gio.FileMonitorFlags.WATCH_MOVES,
+                    None,
+                )
+            except GLib.Error:
+                continue
+            monitor.connect("changed", self._on_vdir_changed)
+            self._file_monitors.append(monitor)
+
+    def _on_vdir_changed(self, *_args) -> None:
+        if self._refresh_source:
+            GLib.source_remove(self._refresh_source)
+        self._refresh_source = GLib.timeout_add(500, self._refresh_after_vdir_change)
+
+    def _refresh_after_vdir_change(self) -> bool:
+        self._refresh_source = 0
+        self._refresh()
+        return GLib.SOURCE_REMOVE
+
     def _error_page(self, error: str) -> Adw.StatusPage:
         return Adw.StatusPage(
             icon_name="dialog-error-symbolic",
@@ -626,6 +652,12 @@ class KhoraWindow(Adw.ApplicationWindow):
         if self._save_source:
             GLib.source_remove(self._save_source)
             self._save_source = 0
+        if self._refresh_source:
+            GLib.source_remove(self._refresh_source)
+            self._refresh_source = 0
+        for monitor in self._file_monitors:
+            monitor.cancel()
+        self._file_monitors.clear()
         self._save_state()
         return False
 
diff --git a/projects/khora/tests/test_khal_adapter.py b/projects/khora/tests/test_khal_adapter.py
index 80d44b28..57031c3b 100644
--- a/projects/khora/tests/test_khal_adapter.py
+++ b/projects/khora/tests/test_khal_adapter.py
@@ -1,4 +1,5 @@
 import datetime as dt
+from pathlib import Path
 from types import SimpleNamespace
 
 from khora.khal_adapter import KhalRepository
@@ -25,6 +26,10 @@ def test_calendar_accounts_come_from_their_parent_directory() -> None:
     calendars = repository.calendars
 
     assert tuple(calendar.account for calendar in calendars) == ("personal", "university")
+    assert repository.watch_paths == (
+        Path("/home/example/Calendars/personal/default"),
+        Path("/home/example/Calendars/university/classes"),
+    )
 
 
 def test_event_details_cross_the_khal_boundary() -> None: