diff --git a/proto/mf.proto b/proto/mf.proto
index c927172..3a849fa 100644
--- a/proto/mf.proto
+++ b/proto/mf.proto
@@ -3,33 +3,34 @@ syntax = "proto3";
 option go_package = "mfer";
 
 message MFFile {
-  enum Version {
-    NONE = 0;
-    ONE = 1; // only one for now
-  }
-  Version version = 1;
-  bytes innerMessage = 2;
+    enum Version {
+        NONE = 0;
+        ONE = 1; // only one for now
+    }
+    Version version = 1;
+    bytes innerMessage = 2;
 
-  // these are used solely to detect corruption/truncation
-  // and not for cryptographic integrity.
-  uint64 size = 3;
-  bytes sha256 = 4;
+    // these are used solely to detect corruption/truncation
+    // and not for cryptographic integrity.
+    uint64 size = 3;
+    bytes sha256 = 4;
 
-  // think we might use gosignify instead of gpg:
-  // github.com/frankbraun/gosignify
+    // think we might use gosignify instead of gpg:
+    // github.com/frankbraun/gosignify
 
-  //detached signature, ascii or binary
-  optional bytes signature = 5;
-  //full GPG key id
-  optional bytes signer = 6;
-  //full GPG signing public key, ascii or binary
-  optional bytes signingPubKey = 7;
+    //detached signature, ascii or binary
+    optional bytes signature = 5;
+    //full GPG key id
+    optional bytes signer = 6;
+    //full GPG signing public key, ascii or binary
+    optional bytes signingPubKey = 7;
 }
 
 message MFFilePath {
     string path = 1;
+    uint64 size = 2;
     // when verifying, count(hashes) must be > 0.
-    optional repeated MFFileChecksum hashes = 2;
+    optional repeated MFFileChecksum hashes = 201;
     optional string mimeType = 101;
     optional string mtime = 102;
     optional string ctime = 103;
@@ -42,11 +43,11 @@ message MFFileChecksum {
 }
 
 message MFFileInner {
-  enum Version {
-    NONE = 0;
-    ONE = 1; // only one for now
-  }
-  Version version = 1;
-  uint64 count = 2;
-  repeated MFFilePath files = 3;
+    enum Version {
+        NONE = 0;
+        ONE = 1; // only one for now
+    }
+    Version version = 1;
+    uint64 count = 2;
+    repeated MFFilePath files = 3;
 }