diff --git a/README.md b/README.md
index c14f1fa..703a4ef 100644
--- a/README.md
+++ b/README.md
@@ -21,4 +21,4 @@ Currently, I'm considering the following Capturers (based on my own life):
 - [ ] [Steam Capturer](design/steam.md)
 - [ ] [Netflix](design/netflix.md)
 - [ ] [Deezer](design/deezer.md)
-- [ ] Calendar/CalDav
+- [ ] [Calendar/CalDav](design/caldav.md)
diff --git a/design/caldav.md b/design/caldav.md
new file mode 100644
index 0000000..a3f3fdf
--- /dev/null
+++ b/design/caldav.md
@@ -0,0 +1,25 @@
+# CalDav Capturer
+
+The CalDav capturer captures new events in a calendar.
+
+CalDav uses the [iCalendar](https://en.wikipedia.org/wiki/ICalendar) format.
+
+## Configuration
+
+The CalDav capturer needs the URL for the CalDav.
+
+## Internals
+
+There is no single event ID, so we need to keep the DSTART and DEND as unique
+identifiers of each event. New events are the ones not in this list.
+
+- `dstart`: Event start.
+- `end`: Event end.
+
+## Output
+
+```
+{% for event in new_events %}
+Have a new event: {{ event.description }}
+{% endfor %}
+```