Amendment 1 to Recommendation ITU-T G.8260 (2015) provides the following update: ? adds definitions to clause 3.1 ? replaces clause 6.6 to cover both forward and reverse time error measurements ? corrects the association of minimum delay with the forward and reverse time error sequences in clauses I.3.2, and their use in subsequent clauses I.3.2.1, I.3.2.3, I.4.1.2, I.4.2.1.1 and I.4.2.1.3 ? replaces the term "time offset" with "two-way time error" in clauses I.3.4 and I.4.4