diff --git a/index.bs b/index.bs
index f1395a821..70c13465f 100644
--- a/index.bs
+++ b/index.bs
@@ -1274,11 +1274,15 @@ associated.
: name
:: A human-friendly identifier for the entity. For example, this could be a company name for a [=[RP]=], or a
- user's name. This identifier is intended for display.
+ user's name. This identifier is intended for display. Authenticators while creating a credential MUST support
+ minimum of 64 bytes for this field and optionally can truncate how much it wants to store if this field is more
+ than 64 bytes.
: icon
:: A [=URL serializer|serialized=] URL which resolves to an image associated with the entity. For example, this could be
- a user's avatar or a [=[RP]=]'s logo. This URL MUST be an [=a priori authenticated URL=].
+ a user's avatar or a [=[RP]=]'s logo. This URL MUST be an [=a priori authenticated URL=]. Authenticators while
+ creating a credential MUST support minimum of 128 bytes for this field and optionally can drop this field if
+ if this field is more than 128 bytes.
@@ -1315,7 +1319,9 @@ credential.
:: The [=user handle=] of the user account entity.
: displayName
- :: A friendly name for the user account (e.g., "John P. Smith").
+ :: A friendly name for the user account (e.g., "John P. Smith"). Authenticators while creating a credential MUST support
+ minimum of 64 bytes for this field and optionally can truncate how much it wants to store if this field is more
+ than 64 bytes.