diff --git a/src/@dseries/length.m b/src/@dseries/length.m
index b6fbe5840b79da020f4f42c82a3f189504002e27..335aebce5b085ed92661c12f82a0bb47164cc2ae 100644
--- a/src/@dseries/length.m
+++ b/src/@dseries/length.m
@@ -1,4 +1,4 @@
-function length(o)
+function length(o) % --*-- Unitary tests --*--
 
 % Overloads size function.
 
diff --git a/src/@dseries/size.m b/src/@dseries/size.m
index 23dbcd6648707623a90af04e87d1c026dd604c7d..23abd7a354f679e12129d7e807e77370b5cfde24 100644
--- a/src/@dseries/size.m
+++ b/src/@dseries/size.m
@@ -1,4 +1,4 @@
-function varargout = size(o, varargin)
+function varargout = size(o, varargin) % --*-- Unitary tests --*--
 
 % Overloads size function.