README.md: document JSON "API"HEADmain

1 files changed, 12 insertions, 0 deletions

diff --git a/README.md b/README.md
index 834e9ca..0998e74 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,16 @@ Build and run container using [Podman][]:
 
 Then open <http://localhost:8080/> in your browser.
 
+By default the sentences are returned as plain text delimited by
+newlines.  If the request method is POST and the `Accept` header is set
+to `application/json`, then the sentences are returned as a
+[JSON][]-encoded array.
+
+Example:
+
+    $ curl -X POST -H 'accept: application/json' http://localhost:8080/
+    ["uniquely myocardinate communities",...
+
 ## Build
 
 To build locally (requires [Go][]):
@@ -54,3 +64,5 @@ Note: The `check` target requires [staticcheck][].
   "Go programming language"
 [staticcheck]: https://staticcheck.dev/docs/
   "Go static analyzer."
+[json]: https://json.org/
+  "JavaScript Object Notation"