Wording improvement
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/docs/architecture/psa-migration/psa-legacy-bridges.md b/docs/architecture/psa-migration/psa-legacy-bridges.md
index ec3fcd0..912344e 100644
--- a/docs/architecture/psa-migration/psa-legacy-bridges.md
+++ b/docs/architecture/psa-migration/psa-legacy-bridges.md
@@ -340,5 +340,5 @@
* These functions convert between the signature format used by `mbedtls_pk_{sign,verify}{,_ext}` and the signature format used by `psa_{sign,verify}_{hash,message}`.
* The input and output buffers can overlap.
-* The `bits` parameter is necessary in the DER-to-raw direction because the DER format lacks leading zeros, so something else needs to convey the size of (r,s). The `bits` parameter is not needed in the raw-to-DER direction, but [it can help catch errors](https://github.com/Mbed-TLS/mbedtls/pull/8681#discussion_r1445980971) and the information is readily available in practice.
+* The `bits` parameter is necessary in the DER-to-raw direction because the DER format lacks leading zeros, so something else needs to convey the size of (r,s). The `bits` parameter is redundant in the raw-to-DER direction, but we have it anyway because [it helps catch errors](https://github.com/Mbed-TLS/mbedtls/pull/8681#discussion_r1445980971), and it isn't a burden on the caller because the information is readily available in practice.
* Should these functions rely on the ASN.1 module? We experimented [calling ASN.1 functions](https://github.com/Mbed-TLS/mbedtls/pull/8681), [reimplementing simpler ASN.1 functions](https://github.com/Mbed-TLS/mbedtls/pull/8696), and [providing the functions from the ASN.1 module](https://github.com/Mbed-TLS/mbedtls/pull/8703). Providing the functions from the ASN.1 module [won on a compromise of code size and simplicity](https://github.com/Mbed-TLS/mbedtls/issues/7765#issuecomment-1893670015).