diff --git a/jsonschemas/WellKnown.jsonschema b/jsonschemas/WellKnown.jsonschema
index 0af5914..4a5466f 100644
--- a/jsonschemas/WellKnown.jsonschema
+++ b/jsonschemas/WellKnown.jsonschema
@@ -51,7 +51,8 @@
                 {
                     "type": "boolean"
                 }
-            ]
+            ],
+            "description": "description"
         },
         "bytes_value": {
             "oneOf": [
@@ -79,7 +80,7 @@
                     "type": "null"
                 },
                 {
-                    "pattern": "^[0-9]+(\\.[0-9]{0,9})?s$",
+                    "pattern": "^-?[0-9]+(\\.[0-9]{0,9})?s$",
                     "type": "string",
                     "format": "regex"
                 }