diff --git a/.gitignore b/.gitignore
index ed1c10be16a..f39ff7525a1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,9 @@ docs/src
 *.iml
 *.iws
 
+# Fleet
+.fleet/
+
 # VSCode
 bin/
 
diff --git a/smithy-aws-traits/src/main/java/software/amazon/smithy/aws/traits/HttpChecksumTrait.java b/smithy-aws-traits/src/main/java/software/amazon/smithy/aws/traits/HttpChecksumTrait.java
index 50fdf5bbbef..679792d5cec 100644
--- a/smithy-aws-traits/src/main/java/software/amazon/smithy/aws/traits/HttpChecksumTrait.java
+++ b/smithy-aws-traits/src/main/java/software/amazon/smithy/aws/traits/HttpChecksumTrait.java
@@ -38,6 +38,7 @@
 public final class HttpChecksumTrait extends AbstractTrait implements ToSmithyBuilder<HttpChecksumTrait> {
     public static final ShapeId ID = ShapeId.from("aws.protocols#httpChecksum");
     public static final String CHECKSUM_PREFIX = "x-amz-checksum-";
+    // This list should be in sync with the trait definition in `aws.protocols.smithy`.
     public static final List<String> CHECKSUM_ALGORITHMS = ListUtils.of("CRC64NVME", "CRC32C", "CRC32",
             "SHA1", "SHA256");
     public static final List<String> VALIDATION_MODES = ListUtils.of("ENABLED");
diff --git a/smithy-aws-traits/src/main/resources/META-INF/smithy/aws.protocols.smithy b/smithy-aws-traits/src/main/resources/META-INF/smithy/aws.protocols.smithy
index d4a7be98f3b..16fbbfb2be9 100644
--- a/smithy-aws-traits/src/main/resources/META-INF/smithy/aws.protocols.smithy
+++ b/smithy-aws-traits/src/main/resources/META-INF/smithy/aws.protocols.smithy
@@ -253,8 +253,12 @@ list ChecksumAlgorithmSet {
     member: ChecksumAlgorithm
 }
 
+// This enum should be in sync with the `HttpChecksumTrait` list.
 @private
 enum ChecksumAlgorithm {
+    /// CRC64NVME
+    CRC64NVME
+
     /// CRC32C
     CRC32C