Michael A. Bryan appeals the sentence imposed on him by the district court 1 after he pleaded guilty to a child-pornography charge, in violation of 18 U.S.C. § 2252(a)(2). In a brief filed under An-ders v. California, 386 U.S. 738, 87 S.Ct. 1396, 18 L.Ed.2d 493 (1967), Bryan’s counsel seeks to withdraw and questions whether the sentence — imposed at the bottom of the applicable Guidelines range — is reasonable, and whether the district court erred by not allowing Bryan to self-surrender. Bryan has filed a supplemental brief asserting that he received ineffective assistance of counsel during his criminal proceeding, including at sentencing, and he also appears to deny the truth of unobject-ed-to facts reported in the PSR.

Bryan’s written plea agreement contains a waiver of his right to appeal his sentence, directly or collaterally. We find the appeal waiver to be valid and we therefore enforce it. The plea-hearing transcript shows that Bryan entered into the plea agreement and the appeal waiver knowingly and voluntarily, and we can perceive no injustice that would result from enforcing the waiver. See United States v. Andis, 333 F.3d 886, 889-92 (8th Cir. 2003) (en banc) (discussing enforceability of appeal waiver); United States v. Estrada-Bahe-na, 201 F.3d 1070, 1071 (8th Cir. 2000) (per curiam) (enforcing appeal waiver in An-ders case). Thus, we do not review the arguments raised in Bryan’s pro se supple *469 mental brief or counsel’s argument that Bryan’s sentence is unreasonable. 2

To the extent that the issue of self-surrender is not covered by the appeal waiver, we conclude that the district court did not err in ordering Bryan detained following sentencing. See 18 U.S.C. §§ 3148(b)(1), 3145(c). Finally, after conducting an independent review under Penson v. Ohio, 488 U.S. 75, 80, 109 S.Ct. 346, 102 L.Ed.2d 300 (1988), of any matters not covered by the appeal waiver, we find that there are no nonfrivolous issues.

Accordingly, we affirm. We grant counsel leave to withdraw, subject to the condition that counsel promptly comply with the requirements of Part V of this Court’s Plan to Implement the Criminal Justice Act by advising his client of the procedures for filing a petition for writ of certio-rari pro se.