Documentation for the skip_initial filter (#2760)

components/sensor/index.rst

@@ -406,6 +406,21 @@ Configuration variables:
   published. With this parameter you can specify when the very first value is to be sent.
   Defaults to ``1``.
 
+``skip_initial``
+****************
+
+A simple skip filter; `skip_initial: N` skips the first `N` sensor readings and passes on the
+rest. This can be used when the sensor needs a few readings to 'warm up'. After the initial
+readings have been skipped, this filter does nothing.
+
+.. code-block:: yaml
+
+    # Example configuration entry
+    - platform: wifi_signal
+      # ...
+      filters:
+        - skip_initial: 3
+
 ``throttle``
 ************