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diff --git a/README.md b/README.md
index 2cf8a74..069f8d9 100644
--- a/README.md
+++ b/README.md
@@ -108,6 +108,9 @@ GET /api/posts/[id]
 ImageResult
 ```
 
+To add tags to an image, POST a comma-separated list of new tags to the same
+endpoint.
+
 To upload an image to the database, post a multipart/form-data encoded message
 to the following endpoint with the following fields: `tags`, a comma-separated
 list of tags for the files, and `image`, the file to be uploaded.