diff --git a/source/_topics/templating.markdown b/source/_topics/templating.markdown
index 10f4ff6615a..ff637a5b8af 100644
--- a/source/_topics/templating.markdown
+++ b/source/_topics/templating.markdown
@@ -80,6 +80,7 @@ Home Assistant adds extensions to allow templates to access all of the current s
 - Filter `round(x)` will convert the input to a number and round it to `x` decimals.
 - Filter `timestamp_local`  will convert an UNIX timestamp to local time/data.
 - Filter `timestamp_utc` will convert an UNIX timestamp to UTC time/data.
+- Filter `timestamp_custom(format_string, local_boolean)` will convert an UNIX timestamp to a custom format, the use of a local timestamp is default, supporting [Python format options](https://docs.python.org/3/library/time.html#time.strftime).
 
 ## {% linkable_title Examples %}
 
@@ -199,4 +200,5 @@ It depends per component or platform but it is common to be able to define a tem
 # Timestamps
 {% raw %}{{ value_json.tst | timestamp_local }}{% endraw %}
 {% raw %}{{ value_json.tst | timestamp_utc }}{% endraw %}
+{% raw %}{{ value_json.tst | timestamp_custom('%Y' True) }}{% endraw %}
 ```