diff --git a/src/lib/sgd.h b/src/lib/sgd.h
index 4cb2f2a..06dcc46 100644
--- a/src/lib/sgd.h
+++ b/src/lib/sgd.h
@@ -103,8 +103,8 @@ typedef struct
 	sgd_float epsilon;
 
 	/**
-	 * Damping rate of the classic momentum method, which is typically given 
-	 * between 0 and 1. The default is 0.01.
+	 * Damping rate of the classic momentum method and the NAG method, which 
+	 * is typically given between 0 and 1. The default is 0.01.
 	 */
 	sgd_float mu;
 
diff --git a/src/sample/sample.cpp b/src/sample/sample.cpp
index 6486bc2..b036e38 100644
--- a/src/sample/sample.cpp
+++ b/src/sample/sample.cpp
@@ -78,11 +78,7 @@ int progress(void *instance, sgd_float fx, const sgd_float *x, const sgd_float *
 	const sgd_para *param, const int n_size, const int k)
 {
 	std::clog << "iteration time: " << k << ", fx: " << fx << "\r";
-	if (fx < param->epsilon)
-	{
-		std::clog << std::endl;
-		std::cout << ">" << std::endl;
-	}
+	if (fx < param->epsilon) {std::clog << std::endl;}
 	return 0;
 }