diff --git a/pipeline-application/src/main/java/com/smoketurner/pipeline/application/aws/AmazonSNSNotification.java b/pipeline-application/src/main/java/com/smoketurner/pipeline/application/aws/AmazonSNSNotification.java
index 03c91a1..1139209 100644
--- a/pipeline-application/src/main/java/com/smoketurner/pipeline/application/aws/AmazonSNSNotification.java
+++ b/pipeline-application/src/main/java/com/smoketurner/pipeline/application/aws/AmazonSNSNotification.java
@@ -19,6 +19,7 @@
 import java.time.Duration;
 import java.time.ZonedDateTime;
 import java.util.Objects;
+import javax.annotation.Nullable;
 import javax.annotation.concurrent.Immutable;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonIgnore;
@@ -58,6 +59,7 @@ public ZonedDateTime getTimestamp() {
         return timestamp;
     }
 
+    @Nullable
     @JsonIgnore
     public Duration getDelayDuration() {
         if (timestamp == null) {
diff --git a/pipeline-client/src/test/java/com/smoketurner/pipeline/client/PIpelineClientTest.java b/pipeline-client/src/test/java/com/smoketurner/pipeline/client/PipelineClientTest.java
similarity index 99%
rename from pipeline-client/src/test/java/com/smoketurner/pipeline/client/PIpelineClientTest.java
rename to pipeline-client/src/test/java/com/smoketurner/pipeline/client/PipelineClientTest.java
index 8499066..2ede9f4 100644
--- a/pipeline-client/src/test/java/com/smoketurner/pipeline/client/PIpelineClientTest.java
+++ b/pipeline-client/src/test/java/com/smoketurner/pipeline/client/PipelineClientTest.java
@@ -20,7 +20,7 @@
 import org.junit.Test;
 import io.dropwizard.testing.junit.DropwizardClientRule;
 
-public class PIpelineClientTest {
+public class PipelineClientTest {
 
     @Path("/events")
     public static class EventResource {