diff --git a/internal/crypto/README.md b/internal/crypto/README.md
index 86520c568..cd1a61b69 100644
--- a/internal/crypto/README.md
+++ b/internal/crypto/README.md
@@ -19,8 +19,8 @@ This crate has two features, neither of which are enabled by default:
 
 | C2PA `SigningAlg` | Default (*) | `feature = "rust_native_crypto"` (*) | WASM |
 | --- | --- | --- | --- |
-| `es256` | OpenSSL | OpenSSL | ❌ |
-| `es384` | OpenSSL | OpenSSL | ❌ |
+| `es256` | OpenSSL | `p256` | `p256` |
+| `es384` | OpenSSL | `p384` | `p384` |
 | `es512` | OpenSSL | OpenSSL | ❌ |
 | `ed25519` | OpenSSL | `ed25519-dalek` | `ed25519-dalek` |
 | `ps256` | OpenSSL | `rsa` | `rsa` |
diff --git a/sdk/Cargo.toml b/sdk/Cargo.toml
index 20b9bbcd8..6f49f088b 100644
--- a/sdk/Cargo.toml
+++ b/sdk/Cargo.toml
@@ -32,6 +32,7 @@ serialize_thumbnails = []
 no_interleaved_io = ["file_io"]
 fetch_remote_manifests = ["dep:wasi"]
 json_schema = ["dep:schemars", "c2pa-crypto/json_schema"]
+rust_native_crypto = ["c2pa-crypto/rust_native_crypto"]
 pdf = ["dep:lopdf"]
 v1_api = []