diff --git a/core/src/core/target.rs b/core/src/core/target.rs
index 0d6159604..40bb0e6e7 100644
--- a/core/src/core/target.rs
+++ b/core/src/core/target.rs
@@ -68,6 +68,12 @@ impl Difficulty {
     }
 }
 
+impl fmt::Display for Difficulty {
+	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    write!(f, "{}", self.num)
+  }
+}
+
 impl Add<Difficulty> for Difficulty {
 	type Output = Difficulty;
 	fn add(self, other: Difficulty) -> Difficulty {
diff --git a/grin/src/miner.rs b/grin/src/miner.rs
index a23e30f4b..3c27b65de 100644
--- a/grin/src/miner.rs
+++ b/grin/src/miner.rs
@@ -74,9 +74,10 @@ impl Miner {
 			// transactions) and as long as the head hasn't changed
 			let deadline = time::get_time().sec + 2;
 			let mut sol = None;
-			debug!("Mining at Cuckoo{} for at most 2 secs on block {}.",
+			debug!("Mining at Cuckoo{} for at most 2 secs on block {} at difficulty {}.",
 			       b.header.cuckoo_len,
-			       latest_hash);
+			       latest_hash,
+             b.header.difficulty);
 			let mut iter_count = 0;
 			while head.hash() == latest_hash && time::get_time().sec < deadline {
 				let pow_hash = b.hash();