diff --git a/src/main/java/com/minelittlepony/ducks/package-info.java b/src/main/java/com/minelittlepony/ducks/package-info.java
new file mode 100644
index 00000000..b0c986c7
--- /dev/null
+++ b/src/main/java/com/minelittlepony/ducks/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.ducks;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/main/java/com/minelittlepony/gui/package-info.java b/src/main/java/com/minelittlepony/gui/package-info.java
new file mode 100644
index 00000000..4f7db50d
--- /dev/null
+++ b/src/main/java/com/minelittlepony/gui/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.gui;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/main/java/com/minelittlepony/hdskins/gui/package-info.java b/src/main/java/com/minelittlepony/hdskins/gui/package-info.java
new file mode 100644
index 00000000..be234747
--- /dev/null
+++ b/src/main/java/com/minelittlepony/hdskins/gui/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.hdskins.gui;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/main/java/com/minelittlepony/mixin/package-info.java b/src/main/java/com/minelittlepony/mixin/package-info.java
new file mode 100644
index 00000000..22cdf129
--- /dev/null
+++ b/src/main/java/com/minelittlepony/mixin/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.mixin;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/main/java/com/minelittlepony/model/package-info.java b/src/main/java/com/minelittlepony/model/package-info.java
new file mode 100644
index 00000000..6dc6a541
--- /dev/null
+++ b/src/main/java/com/minelittlepony/model/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.model;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/main/java/com/minelittlepony/model/pony/armor/package-info.java b/src/main/java/com/minelittlepony/model/pony/armor/package-info.java
new file mode 100644
index 00000000..63f362af
--- /dev/null
+++ b/src/main/java/com/minelittlepony/model/pony/armor/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.model.pony.armor;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/main/java/com/minelittlepony/model/pony/package-info.java b/src/main/java/com/minelittlepony/model/pony/package-info.java
new file mode 100644
index 00000000..5ea323a5
--- /dev/null
+++ b/src/main/java/com/minelittlepony/model/pony/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.model.pony;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/main/java/com/minelittlepony/package-info.java b/src/main/java/com/minelittlepony/package-info.java
new file mode 100644
index 00000000..a1d3fc42
--- /dev/null
+++ b/src/main/java/com/minelittlepony/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/main/java/com/minelittlepony/renderer/layer/package-info.java b/src/main/java/com/minelittlepony/renderer/layer/package-info.java
new file mode 100644
index 00000000..ff86e160
--- /dev/null
+++ b/src/main/java/com/minelittlepony/renderer/layer/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.renderer.layer;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/main/java/com/minelittlepony/renderer/package-info.java b/src/main/java/com/minelittlepony/renderer/package-info.java
new file mode 100644
index 00000000..f99a8bdb
--- /dev/null
+++ b/src/main/java/com/minelittlepony/renderer/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.renderer;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/main/java/com/minelittlepony/util/package-info.java b/src/main/java/com/minelittlepony/util/package-info.java
new file mode 100644
index 00000000..5463a5b9
--- /dev/null
+++ b/src/main/java/com/minelittlepony/util/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.util;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;