diff --git a/src/schema.graphqls b/src/schema.graphql
similarity index 99%
rename from src/schema.graphqls
rename to src/schema.graphql
index 002fea60c8b82d0fb640f371645ed2f88e68f5b9..c9bfc10ac6444ace558fa8075780834196e1eabc 100644
--- a/src/schema.graphqls
+++ b/src/schema.graphql
@@ -228,6 +228,8 @@ type Block {
   UDTime: Int
   writtenOn: Int!
   written_on: String!
+
+  commonTime: Int!
 }
 
 type BlockchainParameters {