diff --git a/README.md b/README.md
index e1943ca..d47f65a 100644
--- a/README.md
+++ b/README.md
@@ -32,8 +32,9 @@ automatic harvesting on a given schedule, and handling of errors from the API
 response.  It also provides the ability to aggregate individual data points into
 metrics.
 
-This example code assumes you've set the the `NEW_RELIC_API_KEY` environment
-variable to your Insights Insert API Key.  A larger example is provided in
+This example code assumes you've set the the `NEW_RELIC_INSIGHTS_INSERT_API_KEY`
+environment variable to your Insights Insert API Key.  A larger example is
+provided in
 [examples/server/main.go](./examples/server/main.go).
 
 ```go
@@ -50,7 +51,7 @@ import (
 
 func main() {
 	// First create a Harvester.  APIKey is the only required field.
-	h, err := telemetry.NewHarvester(telemetry.ConfigAPIKey(os.Getenv("NEW_RELIC_API_KEY")))
+	h, err := telemetry.NewHarvester(telemetry.ConfigAPIKey(os.Getenv("NEW_RELIC_INSIGHTS_INSERT_API_KEY")))
 	if err != nil {
 		fmt.Println(err)
 	}
diff --git a/cumulative/cumulative_test.go b/cumulative/cumulative_test.go
index a3380d1..57a5a7e 100644
--- a/cumulative/cumulative_test.go
+++ b/cumulative/cumulative_test.go
@@ -17,7 +17,7 @@ import (
 
 func Example() {
 	h, err := telemetry.NewHarvester(
-		telemetry.ConfigAPIKey(os.Getenv("NEW_RELIC_API_KEY")),
+		telemetry.ConfigAPIKey(os.Getenv("NEW_RELIC_INSIGHTS_INSERT_API_KEY")),
 	)
 	if err != nil {
 		fmt.Println(err)
diff --git a/examples/server/main.go b/examples/server/main.go
index f6cbd7c..246eb5b 100644
--- a/examples/server/main.go
+++ b/examples/server/main.go
@@ -122,7 +122,7 @@ func main() {
 	rand.Seed(time.Now().UnixNano())
 	var err error
 	h, err = telemetry.NewHarvester(
-		telemetry.ConfigAPIKey(mustGetEnv("NEW_RELIC_API_KEY")),
+		telemetry.ConfigAPIKey(mustGetEnv("NEW_RELIC_INSIGHTS_INSERT_API_KEY")),
 		telemetry.ConfigCommonAttributes(map[string]interface{}{
 			"app.name":  "myServer",
 			"host.name": "dev.server.com",
diff --git a/telemetry/README.md b/telemetry/README.md
index fded71f..8e85dab 100644
--- a/telemetry/README.md
+++ b/telemetry/README.md
@@ -11,7 +11,7 @@ the background.
 
   ```go
   harvester := telemetry.NewHarvester(
-    telemetry.ConfigAPIKey(os.Getenv("NEW_RELIC_API_KEY")),
+    telemetry.ConfigAPIKey(os.Getenv("NEW_RELIC_INSIGHTS_INSERT_API_KEY")),
   )
   ```
 
diff --git a/telemetry/aggregated_metrics_test.go b/telemetry/aggregated_metrics_test.go
index 952e881..6220127 100644
--- a/telemetry/aggregated_metrics_test.go
+++ b/telemetry/aggregated_metrics_test.go
@@ -78,19 +78,19 @@ func BenchmarkAggregatedMetric(b *testing.B) {
 }
 
 func ExampleMetricAggregator_Count() {
-	h, _ := NewHarvester(ConfigAPIKey(os.Getenv("NEW_RELIC_API_KEY")))
+	h, _ := NewHarvester(ConfigAPIKey(os.Getenv("NEW_RELIC_INSIGHTS_INSERT_API_KEY")))
 	count := h.MetricAggregator().Count("myCount", map[string]interface{}{"zip": "zap"})
 	count.Increment()
 }
 
 func ExampleMetricAggregator_Gauge() {
-	h, _ := NewHarvester(ConfigAPIKey(os.Getenv("NEW_RELIC_API_KEY")))
+	h, _ := NewHarvester(ConfigAPIKey(os.Getenv("NEW_RELIC_INSIGHTS_INSERT_API_KEY")))
 	gauge := h.MetricAggregator().Gauge("temperature", map[string]interface{}{"zip": "zap"})
 	gauge.Value(23.4)
 }
 
 func ExampleMetricAggregator_Summary() {
-	h, _ := NewHarvester(ConfigAPIKey(os.Getenv("NEW_RELIC_API_KEY")))
+	h, _ := NewHarvester(ConfigAPIKey(os.Getenv("NEW_RELIC_INSIGHTS_INSERT_API_KEY")))
 	summary := h.MetricAggregator().Summary("mySummary", map[string]interface{}{"zip": "zap"})
 	summary.RecordDuration(3 * time.Second)
 }
diff --git a/telemetry/config.go b/telemetry/config.go
index 322c334..44619e1 100644
--- a/telemetry/config.go
+++ b/telemetry/config.go
@@ -13,7 +13,7 @@ import (
 
 // Config customizes the behavior of a Harvester.
 type Config struct {
-	// APIKey is required.
+	// APIKey is required  and refers to your New Relic Insights Insert API key.
 	APIKey string
 	// Client is the http.Client used for making requests.
 	Client *http.Client
@@ -47,7 +47,8 @@ type Config struct {
 	ProductVersion string
 }
 
-// ConfigAPIKey sets the Config's APIKey which is required.
+// ConfigAPIKey sets the Config's APIKey which is required  and refers to your
+// New Relic Insights Insert API key.
 func ConfigAPIKey(key string) func(*Config) {
 	return func(cfg *Config) {
 		cfg.APIKey = key
diff --git a/telemetry/example_test.go b/telemetry/example_test.go
index 6d12745..7b94ebd 100644
--- a/telemetry/example_test.go
+++ b/telemetry/example_test.go
@@ -12,8 +12,8 @@ import (
 
 func Example() {
 	h, err := NewHarvester(
-		// APIKey is the only required field.
-		ConfigAPIKey(os.Getenv("NEW_RELIC_API_KEY")),
+		// APIKey is the only required field and refers to your New Relic Insights Insert API key.
+		ConfigAPIKey(os.Getenv("NEW_RELIC_INSIGHTS_INSERT_API_KEY")),
 		ConfigCommonAttributes(map[string]interface{}{
 			"app.name": "myApplication",
 		}),
@@ -61,7 +61,7 @@ func Example() {
 
 func ExampleNewHarvester() {
 	h, err := NewHarvester(
-		ConfigAPIKey(os.Getenv("NEW_RELIC_API_KEY")),
+		ConfigAPIKey(os.Getenv("NEW_RELIC_INSIGHTS_INSERT_API_KEY")),
 	)
 	if err != nil {
 		fmt.Println(err)
@@ -78,7 +78,7 @@ func ExampleNewHarvester() {
 
 func ExampleHarvester_RecordMetric() {
 	h, _ := NewHarvester(
-		ConfigAPIKey(os.Getenv("NEW_RELIC_API_KEY")),
+		ConfigAPIKey(os.Getenv("NEW_RELIC_INSIGHTS_INSERT_API_KEY")),
 	)
 	start := time.Now()
 	h.RecordMetric(Count{