# Add annotations to your charts on Holistics

**URL:** https://community.holistics.io/t/add-annotations-to-your-charts-on-holistics/2429
**Category:** Tips and Showcases
**Created:** [April 1, 2025, 5:37pm UTC](https://community.holistics.io/t/add-annotations-to-your-charts-on-holistics/2429 "2025-04-01T17:37:44Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![anthonytd](https://community.holistics.io/user_avatar/community.holistics.io/anthonytd/32/374_2.png) [@anthonytd](https://community.holistics.io/u/anthonytd)
#### Post date: [April 1, 2025, 5:37pm UTC](https://community.holistics.io/t/add-annotations-to-your-charts-on-holistics/2429/1 "2025-04-01T17:37:44Z")

</div>

Annotations can be very useful to help your business users understand _why_ certain changes happened in the data — whether it’s a feature release, a marketing campaign, or a system issue.

In this post, I’ll show you a quick tip on how to add annotations to your charts in Holistics, using a reusable approach that works across multiple charts.

## Approach

1. **Create an Annotations Data Model**  
Build a model with `event_date` and `annotation` columns.
2. **Join It to Your Dataset**  
Use a date-based relationship between your main date field and the annotations.
3. **Display on Chart**

- Add `count(annotation)` as a measure on the **secondary Y-axis**
- Show data points (or bars) only on dates with annotations
- Add `max(annotation)` to the tooltip for context

You can use either **line** or **column** chart formats depending on the visual style you prefer.

📝 Full guide with detailed config here: [Adding Annotations to Charts (Holistics Docs)](https://docs.holistics.io/guides/adding-annotations-to-charts)

## 🎉 Result

Your charts now include markers like these:

 ![](https://community.holistics.io/uploads/default/original/2X/b/bb735bb362747d7b410ab75b01e9c75359c2961b.png)  
 ![](https://community.holistics.io/uploads/default/original/2X/5/57601f473398f3b0d911750beecd2e26d574a077.png)