diff --git a/README.md b/README.md
index 9ec4436..4370a9a 100644
--- a/README.md
+++ b/README.md
@@ -107,7 +107,7 @@ mappings:
     action: "$2"
     outcome: "$3"
     job: "test_dispatcher"
-- match: *.signup.*.*
+- match: "*.signup.*.*"
   labels:
     name: "signup_events_total"
     provider: "$2"
diff --git a/mapper_test.go b/mapper_test.go
index 4fd323e..649ded1 100644
--- a/mapper_test.go
+++ b/mapper_test.go
@@ -265,6 +265,41 @@ mappings:
     `,
 			configBad: true,
 		},
+		// Example from the README.
+		{
+			config: `
+mappings:
+- match: test.dispatcher.*.*.*
+  labels:
+    name: "dispatcher_events_total"
+    processor: "$1"
+    action: "$2"
+    outcome: "$3"
+    job: "test_dispatcher"
+- match: "*.signup.*.*"
+  labels:
+    name: "signup_events_total"
+    provider: "$2"
+    outcome: "$3"
+    job: "${1}_server"
+`,
+			mappings: map[string]map[string]string{
+				"test.dispatcher.FooProcessor.send.success": map[string]string{
+					"name":      "dispatcher_events_total",
+					"processor": "FooProcessor",
+					"action":    "send",
+					"outcome":   "success",
+					"job":       "test_dispatcher",
+				},
+				"foo_product.signup.facebook.failure": map[string]string{
+					"name":     "signup_events_total",
+					"provider": "facebook",
+					"outcome":  "failure",
+					"job":      "foo_product_server",
+				},
+				"test.web-server.foo.bar": map[string]string{},
+			},
+		},
 	}
 
 	mapper := metricMapper{}