diff --git a/docs/tuf-spec.md b/docs/tuf-spec.md
index d8f49dcf..e80f6357 100644
--- a/docs/tuf-spec.md
+++ b/docs/tuf-spec.md
@@ -458,6 +458,7 @@ Version: **1.0 (Draft)**
        { "signed" : ROLE,
          "signatures" : [
             { "keyid" : KEYID,
+              "method": METHOD,
               "sig" : SIGNATURE }
             , ... ]
        }
@@ -691,6 +692,7 @@ Version: **1.0 (Draft)**
        "signatures": [
         {
          "keyid": "fce9cf1cc86b0945d6a042f334026f31ed8e4ee1510218f198e8d3f191d15309",
+         "method": "ed25519",
          "sig": "f7f03b13e3f4a78a23561419fc0dd741a637e49ee671251be9f8f3fceedfc112e4
                  4ee3aaff2278fad9164ab039118d4dc53f22f94900dae9a147aa4d35dcfc0f"
         }
@@ -822,6 +824,7 @@ Version: **1.0 (Draft)**
        "signatures": [
         {
          "keyid": "93ec2c3dec7cc08922179320ccd8c346234bf7f21705268b93e990d5273a2a3b",
+         "method": "ed25519",
          "sig": "e9fd40008fba263758a3ff1dc59f93e42a4910a282749af915fbbea1401178e5a0
                  12090c228f06db1deb75ad8ddd7e40635ac51d4b04301fce0fd720074e0209"
         }
@@ -900,6 +903,7 @@ Version: **1.0 (Draft)**
        "signatures": [
         {
          "keyid": "1a2b4110927d4cba257262f614896179ff85ca1f1353a41b5224ac474ca71cb4",
+         "method": "ed25519",
          "sig": "90d2a06c7a6c2a6a93a9f5771eb2e5ce0c93dd580bebc2080d10894623cfd6eaed
                  f4df84891d5aa37ace3ae3736a698e082e12c300dfe5aee92ea33a8f461f02"
         }