diff --git a/miner-api/src/lib.rs b/miner-api/src/lib.rs
index 6c15fc34..5e540991 100644
--- a/miner-api/src/lib.rs
+++ b/miner-api/src/lib.rs
@@ -83,8 +83,8 @@ pub struct MiningRequest {
 	pub job_id: String,
 	/// Hex encoded header hash (32 bytes -> 64 chars, no 0x prefix)
 	pub mining_hash: String,
-	/// Distance threshold (U512 as decimal string)
-	pub distance_threshold: String,
+	/// Difficulty (U512 as decimal string). Must be non-zero.
+	pub difficulty: String,
 }
 
 /// Response payload for job submission (`/mine`) and cancellation (`/cancel`).
diff --git a/node/src/service.rs b/node/src/service.rs
index 3867262a..13965cad 100644
--- a/node/src/service.rs
+++ b/node/src/service.rs
@@ -175,11 +175,8 @@ async fn handle_external_mining(
 		mining_hash,
 		difficulty
 	);
-	let job = MiningRequest {
-		job_id: job_id.clone(),
-		mining_hash,
-		distance_threshold: difficulty.to_string(),
-	};
+	let job =
+		MiningRequest { job_id: job_id.clone(), mining_hash, difficulty: difficulty.to_string() };
 
 	server.broadcast_job(job).await;
 
diff --git a/primitives/consensus/qpow/src/lib.rs b/primitives/consensus/qpow/src/lib.rs
index 6e38f6b8..28080664 100644
--- a/primitives/consensus/qpow/src/lib.rs
+++ b/primitives/consensus/qpow/src/lib.rs
@@ -16,7 +16,7 @@ sp_api::decl_runtime_apis! {
 		/// Get the max possible difficulty for work calculation
 		fn get_max_difficulty() -> U512;
 
-		/// Get the current difficulty (max_distance / distance_threshold)
+		/// Get the current mining difficulty
 		fn get_difficulty() -> U512;
 
 		/// Get last block timestamp