diff --git a/cmd/mempool/models/gas_stats.go b/cmd/mempool/models/gas_stats.go
index 695260e..8bbdc51 100644
--- a/cmd/mempool/models/gas_stats.go
+++ b/cmd/mempool/models/gas_stats.go
@@ -13,13 +13,13 @@ import (
 type GasStats struct {
 	//nolint
 	tableName      struct{} `pg:"gas_stats"`
-	Network        string   `pg:",pk" json:"network"`
-	Hash           string   `pg:",pk" json:"hash"`
-	TotalGasUsed   uint64   `pg:"total_gas_used" json:"total_gas_used"`
-	TotalFee       uint64   `pg:"total_fee" json:"total_fee"`
-	UpdatedAt      int64    `json:"updated_at"`
-	LevelInMempool uint64   `json:"level_in_mempool"`
-	LevelInChain   uint64   `json:"level_in_chain"`
+	Network        string   `pg:",pk" json:"network" comment:"Identifies belonging network."`
+	Hash           string   `pg:",pk" json:"hash" comment:"Hash of the operation."` // DISCUSS
+	TotalGasUsed   uint64   `pg:"total_gas_used" json:"total_gas_used" comment:"Total amount of used gas."`
+	TotalFee       uint64   `pg:"total_fee" json:"total_fee" comment:"Total amount of fee."`
+	UpdatedAt      int64    `json:"updated_at" comment:"Date of last update in seconds since UNIX epoch."`
+	LevelInMempool uint64   `json:"level_in_mempool" comment:"Level of the block at which the statistics has been calculated in mempool."` // DISCUSS
+	LevelInChain   uint64   `json:"level_in_chain" comment:"Level of the block at which the statistics has been calculated in chain."`     // DISCUSS
 }
 
 // BeforeInsert -