diff --git a/CHANGELOG.md b/CHANGELOG.md
index 05ecf3e..ceae34c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 # Changelog
 All notable changes to this project will be documented in this file.
 
+## [Unreleased]
+### Added
+- support parsing the new `--checksum` flag for ADD instructions ([#116](https://github.com/rcjsuen/dockerfile-utils/issues/116))
+
 ## [0.12.0] - 2023-09-09
 ### Added
 - support parsing the new `--start-interval` flag for HEALTHCHECK instructions ([#115](https://github.com/rcjsuen/dockerfile-utils/issues/115))
diff --git a/src/dockerValidator.ts b/src/dockerValidator.ts
index 9201891..8124058 100644
--- a/src/dockerValidator.ts
+++ b/src/dockerValidator.ts
@@ -675,7 +675,7 @@ export class Validator {
                             if (problem !== null) {
                                 problems.push(problem);
                             }
-                        } else if (name !== "chmod" && name !== "chown") {
+                        } else if (name !== "chmod" && name !== "chown" && name !== "checksum") {
                             let range = flag.getNameRange();
                             problems.push(Validator.createUnknownAddFlag(addInstructionRange.start.line, flagRange.start, range.end, name));
                         }
@@ -684,8 +684,8 @@ export class Validator {
                     if (addDestinationDiagnostic !== null) {
                         problems.push(addDestinationDiagnostic);
                     }
-                    this.checkFlagValue(addInstructionRange.start.line, addFlags, ["chmod", "chown"], problems);
-                    this.checkDuplicateFlags(addInstructionRange.start.line, addFlags, ["chmod", "chown", "link"], problems);
+                    this.checkFlagValue(addInstructionRange.start.line, addFlags, ["chmod", "chown", "checksum"], problems);
+                    this.checkDuplicateFlags(addInstructionRange.start.line, addFlags, ["chmod", "chown", "checksum", "link"], problems);
                     this.checkJSONQuotes(instruction, problems);
                     break;
                 case "COPY":
diff --git a/test/dockerValidator.test.ts b/test/dockerValidator.test.ts
index 6c795f6..b7481dd 100644
--- a/test/dockerValidator.test.ts
+++ b/test/dockerValidator.test.ts
@@ -2241,6 +2241,26 @@ describe("Docker Validator Tests", function() {
                 });
             });
 
+            describe("checksum", () => {
+                it("ok", () => {
+                    const diagnostics = validateDockerfile("FROM alpine\nADD --checksum=sha256:24454f830cdb571e2c4ad15481119c43b3cafd48dd869a9b2945d1036d1dc68d https://mirrors.edge.kernel.org/pub/linux/kernel/Historic/linux-0.01.tar.gz /");
+                    assert.strictEqual(diagnostics.length, 0);
+                });
+
+                it("flag no value", () => {
+                    const diagnostics = validateDockerfile("FROM alpine\nADD --checksum https://mirrors.edge.kernel.org/pub/linux/kernel/Historic/linux-0.01.tar.gz /");
+                    assert.strictEqual(diagnostics.length, 1);
+                    assertFlagMissingValue(diagnostics[0], 1, "checksum", 1, 6, 1, 14);
+                });
+
+                it("duplicate flag", () => {
+                    const diagnostics = validateDockerfile("FROM alpine\nADD --checksum=abc --checksum=123 a /b");
+                    assert.strictEqual(diagnostics.length, 2);
+                    assertFlagDuplicate(diagnostics[0], 1, "checksum", 1, 6, 1, 14);
+                    assertFlagDuplicate(diagnostics[1], 1, "checksum", 1, 21, 1, 29);
+                });
+            });
+
             it("unknown flag", function() {
                 let diagnostics = validateDockerfile("FROM alpine\nADD --x=bb . .");
                 assert.equal(diagnostics.length, 1);