diff --git a/src/shogun/evaluation/PRCEvaluation.h b/src/shogun/evaluation/PRCEvaluation.h
index 6d5ad9575fa..93b5a83bce9 100644
--- a/src/shogun/evaluation/PRCEvaluation.h
+++ b/src/shogun/evaluation/PRCEvaluation.h
@@ -57,6 +57,8 @@ class CPRCEvaluation: public CBinaryClassEvaluation
 	float64_t get_auPRC();
 
 	/** get PRC
+	 * precision is dim0 (x)
+	 * recall is dim1 (y)
 	 * @return PRC graph matrix
 	 */
 	SGMatrix<float64_t> get_PRC();