diff --git a/docs/spec/api.md b/docs/spec/api.md
index 032ddcf3..c5768305 100644
--- a/docs/spec/api.md
+++ b/docs/spec/api.md
@@ -989,7 +989,7 @@ Content-Type: application/json; charset=utf-8
    "tag": <tag>,
    "fsLayers": [
       {
-         "blobSum": <tarsum>
+         "blobSum": "<digest>"
       },
       ...
     ]
@@ -1120,7 +1120,7 @@ Content-Type: application/json; charset=utf-8
    "tag": <tag>,
    "fsLayers": [
       {
-         "blobSum": <tarsum>
+         "blobSum": "<digest>"
       },
       ...
     ]
@@ -1242,7 +1242,7 @@ Content-Type: application/json; charset=utf-8
             "code": "BLOB_UNKNOWN",
             "message": "blob unknown to registry",
             "detail": {
-                "digest": <tarsum>
+                "digest": "<digest>"
             }
         },
         ...
@@ -1446,7 +1446,7 @@ The error codes that may be included in the response body are enumerated below:
 
 ### Blob
 
-Fetch the blob identified by `name` and `digest`. Used to fetch layers by tarsum digest.
+Fetch the blob identified by `name` and `digest`. Used to fetch layers by digest.
 
 
 
@@ -1794,7 +1794,7 @@ Initiate a resumable blob upload. If successful, an upload location will be prov
 ##### Initiate Monolithic Blob Upload
 
 ```
-POST /v2/<name>/blobs/uploads/?digest=<tarsum>
+POST /v2/<name>/blobs/uploads/?digest=<digest>
 Host: <registry host>
 Authorization: <scheme> <token>
 Content-Length: <length of blob>
@@ -2341,7 +2341,7 @@ Complete the upload specified by `uuid`, optionally appending the body as the fi
 
 
 ```
-PUT /v2/<name>/blobs/uploads/<uuid>?digest=<tarsum>
+PUT /v2/<name>/blobs/uploads/<uuid>?digest=<digest>
 Host: <registry host>
 Authorization: <scheme> <token>
 Content-Range: <start of range>-<end of range, inclusive>
diff --git a/registry/api/v2/descriptors.go b/registry/api/v2/descriptors.go
index 833bff8b..0baa5ee7 100644
--- a/registry/api/v2/descriptors.go
+++ b/registry/api/v2/descriptors.go
@@ -135,7 +135,7 @@ const (
    "tag": <tag>,
    "fsLayers": [
       {
-         "blobSum": <tarsum>
+         "blobSum": "<digest>"
       },
       ...
     ]
@@ -606,7 +606,7 @@ var routeDescriptors = []RouteDescriptor{
             "code": "BLOB_UNKNOWN",
             "message": "blob unknown to registry",
             "detail": {
-                "digest": <tarsum>
+                "digest": "<digest>"
             }
         },
         ...
@@ -712,7 +712,7 @@ var routeDescriptors = []RouteDescriptor{
 		Name:        RouteNameBlob,
 		Path:        "/v2/{name:" + RepositoryNameRegexp.String() + "}/blobs/{digest:" + digest.DigestRegexp.String() + "}",
 		Entity:      "Blob",
-		Description: "Fetch the blob identified by `name` and `digest`. Used to fetch layers by tarsum digest.",
+		Description: "Fetch the blob identified by `name` and `digest`. Used to fetch layers by digest.",
 		Methods: []MethodDescriptor{
 
 			{
@@ -898,7 +898,7 @@ var routeDescriptors = []RouteDescriptor{
 							{
 								Name:        "digest",
 								Type:        "query",
-								Format:      "<tarsum>",
+								Format:      "<digest>",
 								Regexp:      digest.DigestRegexp,
 								Description: `Digest of uploaded blob. If present, the upload will be completed, in a single request, with contents of the request body as the resulting blob.`,
 							},
@@ -1173,7 +1173,7 @@ var routeDescriptors = []RouteDescriptor{
 							{
 								Name:        "digest",
 								Type:        "string",
-								Format:      "<tarsum>",
+								Format:      "<digest>",
 								Regexp:      digest.DigestRegexp,
 								Required:    true,
 								Description: `Digest of uploaded blob.`,