26The Commission, referring to the case-law of the Court of Justice (Case 20/58Phoenix-Rheinrohr and Others v High Authority [1959] ECR 75, Case 23/58Mannesmann and Others v High Authority [1959] ECR 117 and Joined Cases 32/58 and 33/58 Snupat v High Authority [1959] ECR 127, and in Cases 19/69, 20/69, 25/69 and 30/69 Richez-Parise and Others v Commission [1970] ECR 325, paragraph 3, and Case 23/69Fiehn v Commission [1970] ECR 547, paragraph 3), states that communications giving an interpretation of existing measures are not actionable, and that applies, a fortiori, to communications such as the memorandum at issue in this case in which the authority merely refers to rules which have been amended.