diff --git a/notes/1.0.0.markdown b/notes/1.0.0.markdown
index 4dee0c945..789b9bc4e 100644
--- a/notes/1.0.0.markdown
+++ b/notes/1.0.0.markdown
@@ -11,6 +11,7 @@ This is the beta-2 release of sbt 1.0.
 The Scala Center is working with Lightbend to provide [an automatic migration tool][sbt-migration-rewrites].
 
 - sbt 1.0 renames `Global` as scope component to `Zero` to disambiguate from `GlobalScope`. [@eed3si9n][@eed3si9n]
+- sbt 1.0 uses `ConfigRef` in places where `String` was used to reference configuration, such as `update.value.configuration(...)`. Pass in `Configuration`, which implicitly converts to `ConfigRef`.
 
 #### Fixes
 
diff --git a/sbt/src/sbt-test/actions/external-doc/build.sbt b/sbt/src/sbt-test/actions/external-doc/build.sbt
index 1cabf1333..80ead271f 100644
--- a/sbt/src/sbt-test/actions/external-doc/build.sbt
+++ b/sbt/src/sbt-test/actions/external-doc/build.sbt
@@ -31,7 +31,7 @@ val checkApiMappings = taskKey[Unit]("Verifies that the API mappings are collect
 def expectedMappings = Def.task {
   val version = scalaVersion.value
   val binVersion = scalaBinaryVersion.value
-	val ms = update.value.configuration(Compile.name).get.modules.flatMap { mod => 
+	val ms = update.value.configuration(Compile).get.modules.flatMap { mod => 
 		mod.artifacts.flatMap { case (a,f) =>
 			val n = a.name.stripSuffix("_" + binVersion)
 			n match {