diff --git a/README.md b/README.md
index e4a4b71..241cd92 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ Crystal bindings for the [libsodium API](https://libsodium.gitbook.io/doc/)
   - [x] ☑ [Crypto Box Easy](https://libsodium.gitbook.io/doc/public-key_cryptography/authenticated_encryption)
   - [x] [Sealed Box](https://libsodium.gitbook.io/doc/public-key_cryptography/sealed_boxes)
   - [ ] [Combined Signatures](https://libsodium.gitbook.io/doc/public-key_cryptography/public-key_signatures)
-  - [x] [Detached Signatures](https://libsodium.gitbook.io/doc/public-key_cryptography/public-key_signatures)
+  - [x] ☑ [Detached Signatures](https://libsodium.gitbook.io/doc/public-key_cryptography/public-key_signatures)
 - [Secret-Key Cryptography](https://libsodium.gitbook.io/doc/secret-key_cryptography)
   - Secret Box
     - [x] ☑ [Combined mode](https://libsodium.gitbook.io/doc/secret-key_cryptography/authenticated_encryption)
diff --git a/spec/sodium/sign/secret_key_spec.cr b/spec/sodium/sign/secret_key_spec.cr
index 82cee5e..3599325 100644
--- a/spec/sodium/sign/secret_key_spec.cr
+++ b/spec/sodium/sign/secret_key_spec.cr
@@ -1,6 +1,31 @@
 require "../../spec_helper"
 require "../../../src/sodium/sign/secret_key"
 
+detached_test_vectors = [
+  {
+    seed:       "b18e1d0045995ec3d010c387ccfeb984d783af8fbb0f40fa7db126d889f6dadd",
+    secret_key: "b18e1d0045995ec3d010c387ccfeb984d783af8fbb0f40fa7db126d889f6dadd" \
+                "77f48b59caeda77751ed138b0ec667ff50f8768c25d48309a8f386a2bad187fb",
+    public_key: "77f48b59caeda77751ed138b0ec667ff50f8768c25d48309a8f386a2bad187fb",
+    plaintext:  "916c7d1d268fc0e77c1bef238432573c39be577bbea0998936add2b50a653171" \
+               "ce18a542b0b7f96c1691a3be6031522894a8634183eda38798a0c5d5d79fbd01" \
+               "dd04a8646d71873b77b221998a81922d8105f892316369d5224c9983372d2313" \
+               "c6b1f4556ea26ba49d46e8b561e0fc76633ac9766e68e21fba7edca93c4c7460" \
+               "376d7f3ac22ff372c18f613f2ae2e856af40",
+    signature: "6bd710a368c1249923fc7a1610747403040f0cc30815a00f9ff548a896bbda0b" \
+               "4eb2ca19ebcf917f0f34200a9edbad3901b64ab09cc5ef7b9bcc3c40c0ff7509",
+  },
+]
+
+private def sign_from_vec(vec)
+  seckey = Sodium::Sign::SecretKey.new seed: vec[:seed].hexbytes
+  seckey.to_slice.should eq vec[:secret_key].hexbytes
+  seckey.public_key.to_slice.should eq vec[:public_key].hexbytes
+  plaintext = vec[:plaintext].hexbytes
+  signature = vec[:signature].hexbytes
+  {seckey, plaintext, signature}
+end
+
 private def new_sign_key_to_slice
   Sodium::Sign::SecretKey.new.to_slice
 end
@@ -45,4 +70,12 @@ describe Sodium::Sign::SecretKey do
       skey.public_key.verify_detached "bar", sig
     end
   end
+
+  it "RbNaCl detached test vectors" do
+    detached_test_vectors.each do |vec|
+      seckey, plaintext, signature = sign_from_vec vec
+      sig = seckey.sign_detached plaintext
+      sig.should eq signature
+    end
+  end
 end