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2 changes: 1 addition & 1 deletion docs/case-control-studies.md
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## Extract data for the cases

In this step, we will construct [a dataset definition](./ehrql/tutorial/building-a-dataset/index.md) to extract all the data we need for the cases. The dataset definition will include:
In this step, we will construct [a dataset definition](./ehrql/tutorials/introduction-to-ehrql/building-a-dataset/index.md) to extract all the data we need for the cases. The dataset definition will include:

- an *index date variable*
- *matching data*, or the variables we will use to match the cases to the potential controls (e.g. we might want to match patients on age and sex); these variables may or may not be used in later analysis.
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