Documentation.

build.sbt

@@ -184,7 +184,7 @@ ThisBuild / githubWorkflowAddedJobs ++= Seq(
 ThisBuild / tlSitePublishBranch := None // update on tag releases
 lazy val docs = project
   .in(file("site"))
-  .dependsOn(core.jvm, circe.jvm)
+  .dependsOn(core.jvm, circe.jvm, upickle.jvm)
   .enablePlugins(TypelevelSitePlugin)
   .settings(
     scalacOptions --= Seq(

docs/integrations/upickle.md

@@ -0,0 +1,38 @@
+Integration with uPickle
+========================
+
+Records can be converted to/from JSON by using [uPickle][].
+
+[uPickle]: https://com-lihaoyi.github.io/upickle/
+
+Installation
+------------
+
+You need an additional module to use records integrated with [uPickle][].
+
+```scala
+libraryDependencies ++= Seq(
+  "com.github.tarao" %% "record4s-upickle" % "@VERSION@"
+),
+```
+
+From / To JSON
+--------------
+
+Importing `Record.readWriter` enables [uPickle][] to decode/encode records in the ordinary way.
+
+```scala mdoc:mline
+import com.github.tarao.record4s.%
+import com.github.tarao.record4s.upickle.Record.readWriter
+import upickle.default.{read, write}
+
+type Person = % { val name: String; val age: Int }
+
+val json = """{"name":"tarao","age":3}"""
+
+// Read from JSON
+val r = read[Person](json)
+
+// Write it back
+write(r)
+```