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diff --git a/_src/_guides/key-concepts-of-bigchaindb.md b/_src/_guides/key-concepts-of-bigchaindb.md
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Every concept that we describe (e.g. inputs, outputs etc.) has a more detailed description in the subsequent sections.
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The data model of transactions is explained in our [transaction model](https://the-ipdb-transaction-spec.readthedocs.io/en/latest/introduction.html).
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The data model of transactions is explained in our [transaction model](https://the-ipdb-transaction-spec.readthedocs.io/en/latest/introduction.html).