Add a note about the support status of each driver interface
diff --git a/docs/psa/entropy/index.md b/docs/psa/entropy/index.md
index f9b4377..24b11b8 100644
--- a/docs/psa/entropy/index.md
+++ b/docs/psa/entropy/index.md
@@ -6,3 +6,5 @@
**Documentation**: for now, please see the header file:
[`include/psa/crypto_entropy_driver.h`](https://github.com/ARMmbed/mbed-crypto/blob/development/include/psa/crypto_entropy_driver.h)
+
+**Mbed Crypto support status**: Not implemented yet. For now, entropy sources use the [Mbed TLS entropy module](https://tls.mbed.org/kb/how-to/add-entropy-sources-to-entropy-pool).