diff --git a/implementation.schema.json b/implementation.schema.json
index 09f4f84..8416ae3 100644
--- a/implementation.schema.json
+++ b/implementation.schema.json
@@ -8,7 +8,7 @@
         "repoURL": {
             "description": "URL pointing to base GitHub repo.",
             "type": "string",
-            "pattern": "^https://github.com/([^/]+)/([^/]+)(?<!.git)$",
+            "pattern": "^https://github.com/([^/]+)/([^/]+)[a-zA-Z0-9/]{0,20}(?<!.git)$",
             "format": "uri"
         },
         "directory": {
diff --git a/implementations.json b/implementations.json
index 78eb7b5..e23ea8f 100644
--- a/implementations.json
+++ b/implementations.json
@@ -1270,6 +1270,24 @@
             "persistence": true
         }
     },
+    {
+        "repoURL": "https://github.com/glycerine/rpc25519/tree/master/tube",
+        "name": "Tube",
+        "authors": [
+            {
+                "name": "Jason E. Aten, Ph.D.",
+                "github": "glycerine"
+            }
+        ],
+        "language": "Go",
+        "license": "BSD-3-Clause",
+        "features": {
+            "basic": true,
+            "membershipChanges": true,
+            "logCompaction": true,
+            "persistence": true
+        }
+    },
     {
         "repoURL": "https://github.com/goraft/raft",
         "name": "go-raft",