diff --git a/src/main/tjava/com/r35157/evelyn/emc/impl/ref/EvelynMissionControlImpl.tjava b/src/main/tjava/com/r35157/evelyn/emc/impl/ref/EvelynMissionControlImpl.tjava
index d9f6916..20f42cf 100644
--- a/src/main/tjava/com/r35157/evelyn/emc/impl/ref/EvelynMissionControlImpl.tjava
+++ b/src/main/tjava/com/r35157/evelyn/emc/impl/ref/EvelynMissionControlImpl.tjava
@@ -28,9 +28,7 @@ import java.util.List;
 import java.util.Objects;
 import java.util.function.Function;
 
-public final class EvelynMissionControlImpl implements
-        EvelynMissionControl,
-        NenjimProcess {
+public final class EvelynMissionControlImpl implements EvelynMissionControl, NenjimProcess {
 
     // region Constructors
     public EvelynMissionControlImpl(
@@ -55,7 +53,7 @@ public final class EvelynMissionControlImpl implements
     // endregion
 
     // region Private methods
-    private static StatusIndexChart createStatusIndexChart() {
+    private static @NotNull StatusIndexChart createStatusIndexChart() {
         NumberAxis xAxis = new NumberAxis(0, 1, 1);
         xAxis.setLabel("Time");
         xAxis.setTickLabelFormatter(TIMESTAMP_FORMATTER);
@@ -84,7 +82,7 @@ public final class EvelynMissionControlImpl implements
         return new StatusIndexChart(chart, xAxis, yAxis, priceIndexSeries);
     }
 
-    private static double calculateYBound(List<EvelynStatusIndexPoint> history) {
+    private static double calculateYBound(@NotNull List<EvelynStatusIndexPoint> history) {
         BigDecimal maxAbsoluteValue = BigDecimal.ZERO;
         for (EvelynStatusIndexPoint point : history) {
             maxAbsoluteValue = max(maxAbsoluteValue, point.evelynPriceIndex());
@@ -100,9 +98,9 @@ public final class EvelynMissionControlImpl implements
     }
 
     private static void refreshChart(
-            StatusIndexChart statusIndexChart,
-            List<EvelynStatusIndexPoint> history
-    ) {
+            @NotNull StatusIndexChart statusIndexChart,
+            @NotNull List<EvelynStatusIndexPoint> history
+    ) throws IllegalStateException {
         if (!Platform.isFxApplicationThread()) {
             throw new IllegalStateException("Status-index charts must be updated on the JavaFX Application Thread");
         }
@@ -134,7 +132,7 @@ public final class EvelynMissionControlImpl implements
         updateAxisBounds(statusIndexChart, history);
     }
 
-    private static BigDecimal max(BigDecimal currentMaximum, BigDecimal candidate) {
+    private static @NotNull BigDecimal max(@NotNull BigDecimal currentMaximum, @NotNull BigDecimal candidate) {
         return currentMaximum.max(candidate.abs());
     }
 
@@ -156,7 +154,10 @@ public final class EvelynMissionControlImpl implements
         refreshTimeline.playFromStart();
     }
 
-    private TabPane createMissionControlTabs(String color, StatusIndexChart statusIndexChart) {
+    private @NotNull TabPane createMissionControlTabs(
+            @NotNull String color,
+            @NotNull StatusIndexChart statusIndexChart
+    ) {
         TabPane tabs = new TabPane(
                 createOverviewTab(color, statusIndexChart),
                 createMissionControlTab("Portfolio", color),
@@ -172,7 +173,7 @@ public final class EvelynMissionControlImpl implements
         return tabs;
     }
 
-    private Tab createOverviewTab(String color, StatusIndexChart statusIndexChart) {
+    private @NotNull Tab createOverviewTab(@NotNull String color, @NotNull StatusIndexChart statusIndexChart) {
         StackPane content = new StackPane(statusIndexChart.chart());
         content.setStyle("-fx-background-color: " + color + ";");
 
@@ -181,10 +182,10 @@ public final class EvelynMissionControlImpl implements
         return tab;
     }
 
-    private static XYChart.Series<Number, Number> createSeries(
-            String name,
-            List<EvelynStatusIndexPoint> history,
-            Function<EvelynStatusIndexPoint, BigDecimal> valueExtractor
+    private static @NotNull XYChart.Series<Number, Number> createSeries(
+            @NotNull String name,
+            @NotNull List<EvelynStatusIndexPoint> history,
+            @NotNull Function<EvelynStatusIndexPoint, BigDecimal> valueExtractor
     ) {
         XYChart.Series<Number, Number> series = new XYChart.Series<>();
         series.setName(name);
@@ -198,8 +199,8 @@ public final class EvelynMissionControlImpl implements
     }
 
     private static void updateAxisBounds(
-            StatusIndexChart statusIndexChart,
-            List<EvelynStatusIndexPoint> history
+            @NotNull StatusIndexChart statusIndexChart,
+            @NotNull List<EvelynStatusIndexPoint> history
     ) {
         long minimumTimestamp;
         long maximumTimestamp;
@@ -225,7 +226,7 @@ public final class EvelynMissionControlImpl implements
         statusIndexChart.yAxis().setTickUnit(yBound / 5.0);
     }
 
-    private Tab createMissionControlTab(String title, String color) {
+    private @NotNull Tab createMissionControlTab(@NotNull String title, @NotNull String color) {
         StackPane content = new StackPane();
         content.setStyle("-fx-background-color: " + color + ";");
 
@@ -235,7 +236,7 @@ public final class EvelynMissionControlImpl implements
         return tab;
     }
 
-    private TabPane createRootTabs() {
+    private @NotNull TabPane createRootTabs() {
         productionChart = createStatusIndexChart();
         testChart = createStatusIndexChart();