# API documentation updates

**URL:** <https://forum.liquidinstruments.com/t/api-documentation-updates/518>\
**Category:** Announcements and New Releases\
**Created:** [April 13, 2022, 5:05pm UTC](https://forum.liquidinstruments.com/t/api-documentation-updates/518 "2022-04-13T17:05:37Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![PaulC](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.liquidinstruments.com/paulc/32/23_2.png) [@PaulC](https://forum.liquidinstruments.com/u/PaulC)\
**Post date:** [April 13, 2022, 5:05pm UTC](https://forum.liquidinstruments.com/t/api-documentation-updates/518/1 "2022-04-13T17:05:37Z")

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The API documentation at [apis.liquidinstruments.com](https://apis.liquidinstruments.com/) has been updated to include details of the Digital Filter Box, FIR Filter Builder and Lock-in Amplifier instruments.