[#3207] Add some comments

diff --git a/src/bin/perfdhcp/test_control.h b/src/bin/perfdhcp/test_control.h
index b72ac0b5336cb17c052e4a92b08e6b48e117c8bd..891e3a7f359fbb024c551612e07c773add9aef9f 100644 (file)
--- a/src/bin/perfdhcp/test_control.h
+++ b/src/bin/perfdhcp/test_control.h
@@ -206,7 +206,13 @@ public:
         }
 
     private:
+        /// \brief The random values will be uniformly distributed in
+        /// the range provided in the constructor.
         std::uniform_int_distribution<> distribution;
+
+        /// \brief It is a high quality general-purpose random
+        /// generator. It isn't suitable for cryptographic use but is
+        /// good enough for testing.
         std::mt19937 randomness_generator;
     };