diff --git a/include/hash.h b/include/hash.h
index 4c53d48..0a48b60 100644
--- a/include/hash.h
+++ b/include/hash.h
@@ -8,8 +8,9 @@
 
 typedef enum {
     BaseFileObject,
-    DiffObject,
+    FileDiffObject,
     TreeObject,
+    TreeDiffObject
 } ObjectType;
 
 void object_hash(ObjectType, char*, char*);
diff --git a/src/hash.c b/src/hash.c
index bf94229..83e6976 100644
--- a/src/hash.c
+++ b/src/hash.c
@@ -21,8 +21,9 @@ void object_hash(ObjectType obj_type, char* content, char* hex_hash) {
     int header_len;
     switch (obj_type) {
         case BaseFileObject: header_len = snprintf(header, sizeof(header), "basefile %zu", content_len); break;
-        case DiffObject:     header_len = snprintf(header, sizeof(header), "diff %zu",     content_len); break;
+        case FileDiffObject: header_len = snprintf(header, sizeof(header), "filediff %zu", content_len); break;
         case TreeObject:     header_len = snprintf(header, sizeof(header), "tree %zu",     content_len); break;
+        case TreeDiffObject: header_len = snprintf(header, sizeof(header), "treediff %zu", content_len); break;
         default: header_len = 0; break;
     }
     header[header_len] = '\0';