diff --git a/example_pack_test.go b/example_pack_test.go
index 169e0911..9adf8fae 100644
--- a/example_pack_test.go
+++ b/example_pack_test.go
@@ -34,7 +34,7 @@ func ExamplePackManifest_imageV11() {
 	// 1. Set optional parameters
 	opts := oras.PackManifestOptions{
 		ManifestAnnotations: map[string]string{
-			// this timestamp will be automatically generated if not specified
+			// this time stamp will be automatically generated if not specified
 			// use a fixed value here to make the pack result reproducible
 			ocispec.AnnotationCreated: "2000-01-01T00:00:00Z",
 		},
@@ -70,7 +70,7 @@ func ExamplePackManifest_imageV10() {
 	// 1. Set optional parameters
 	opts := oras.PackManifestOptions{
 		ManifestAnnotations: map[string]string{
-			// this timestamp will be automatically generated if not specified
+			// this time stamp will be automatically generated if not specified
 			// use a fixed value here to make the pack result reproducible
 			ocispec.AnnotationCreated: "2000-01-01T00:00:00Z",
 		},
diff --git a/pack.go b/pack.go
index 969dc3ac..d67388a7 100644
--- a/pack.go
+++ b/pack.go
@@ -94,8 +94,9 @@ type PackManifestOptions struct {
 	Layers []ocispec.Descriptor
 
 	// ManifestAnnotations is the annotation map of the manifest. In order to
-	// make PackManifest reproducible, set the key ocispec.AnnotationCreated to
-	// a fixed value. The value must conform to RFC 3339.
+	// make [PackManifest] reproducible, set the key ocispec.AnnotationCreated
+	// (i.e. "org.opencontainers.image.created") to a fixed value. The value
+	// must conform to RFC 3339.
 	ManifestAnnotations map[string]string
 
 	// ConfigDescriptor is a pointer to the descriptor of the config blob.
@@ -128,10 +129,11 @@ var mediaTypeRegexp = regexp.MustCompile(`^[A-Za-z0-9][A-Za-z0-9!#$&-^_.+]{0,126
 //
 // artifactType and opts.ConfigDescriptor.MediaType MUST comply with RFC 6838.
 //
-// Each time when PackManifest is called, it generates a new time stamp in the
-// manifest annotations with the key ocispec.AnnotationCreated. To make
-// PackManifest reproducible, set the key ocispec.AnnotationCreated to a fixed value
-// in opts.ManifestAnnotations. The value MUST conform to RFC 3339.
+// Each time when PackManifest is called, if a time stamp is not specified, a new time
+// stamp is generated in the manifest annotations with the key ocispec.AnnotationCreated
+// (i.e. "org.opencontainers.image.created"). To make [PackManifest] reproducible,
+// set the key ocispec.AnnotationCreated to a fixed value in
+// opts.ManifestAnnotations. The value MUST conform to RFC 3339.
 //
 // If succeeded, returns a descriptor of the packed manifest.
 func PackManifest(ctx context.Context, pusher content.Pusher, packManifestVersion PackManifestVersion, artifactType string, opts PackManifestOptions) (ocispec.Descriptor, error) {