Mention the option name for the dynamic key store
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/docs/architecture/psa-keystore-design.md b/docs/architecture/psa-keystore-design.md
index 54ba8ac..42f0849 100644
--- a/docs/architecture/psa-keystore-design.md
+++ b/docs/architecture/psa-keystore-design.md
@@ -113,6 +113,8 @@
The dynamic key store allows a large number of keys, at the expense of more complex memory management.
+The dynamic key store was added in Mbed TLS 3.6.1. It is enabled by `MBEDTLS_PSA_KEY_STORE_DYNAMIC`, which is enabled by default since Mbed TLS 3.6.1.
+
#### Dynamic key slot performance characteristics
Key management and key access have $O(1)$ amortized performance, and mostly $O(1)$ performance for actions involving keys. More precisely: