51It should be borne in mind that, according to case-law, a reference in a document to a separate document must be considered in the light of Article 190 of the EC Treaty (now Article 253 EC) and does not breach the obligation to state reasons incumbent on the Community institutions. Thus, in its judgment in Case T-504/93Tiercé Ladbroke v Commission [1997] ECR II-923, paragraph 55, the Court of First Instance held that a Commission decision sent to the author of a complaint that gave rise to an investigation, which referred to a letter sent pursuant to Article 6 of Regulation No 99/63, disclosed with sufficient clarity the reasons for which the complaint was rejected, and thus fulfilled the obligation to state reasons under Article 190 of the Treaty. Regardless of whether such a reference is described as a matter of reasoning or of form, that finding applies a fortiori where reference is made to a document annexed to a decision and, therefore, contained in it. Moreover, the applicant has in no way substantiated its suspicions that the Commissioner responsible was unaware of the reasoning for the contested measure.