diff --git a/src/client/java/com/minelittlepony/client/gui/package-info.java b/src/client/java/com/minelittlepony/client/gui/package-info.java
new file mode 100644
index 00000000..b5c83539
--- /dev/null
+++ b/src/client/java/com/minelittlepony/client/gui/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.client.gui;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/client/java/com/minelittlepony/client/model/gear/package-info.java b/src/client/java/com/minelittlepony/client/model/gear/package-info.java
new file mode 100644
index 00000000..7aef826b
--- /dev/null
+++ b/src/client/java/com/minelittlepony/client/model/gear/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.client.model.gear;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/client/java/com/minelittlepony/common/client/gui/package-info.java b/src/client/java/com/minelittlepony/common/client/gui/package-info.java
new file mode 100644
index 00000000..b850bd93
--- /dev/null
+++ b/src/client/java/com/minelittlepony/common/client/gui/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.common.client.gui;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/common/java/com/minelittlepony/common/package-info.java b/src/common/java/com/minelittlepony/common/package-info.java
new file mode 100644
index 00000000..0a21fdff
--- /dev/null
+++ b/src/common/java/com/minelittlepony/common/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.common;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/common/java/com/minelittlepony/hdskins/entity/package-info.java b/src/common/java/com/minelittlepony/hdskins/entity/package-info.java
new file mode 100644
index 00000000..08755de2
--- /dev/null
+++ b/src/common/java/com/minelittlepony/hdskins/entity/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.hdskins.entity;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/common/java/com/minelittlepony/model/capabilities/package-info.java b/src/common/java/com/minelittlepony/model/capabilities/package-info.java
new file mode 100644
index 00000000..85345172
--- /dev/null
+++ b/src/common/java/com/minelittlepony/model/capabilities/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.model.capabilities;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/common/java/com/minelittlepony/model/package-info.java b/src/common/java/com/minelittlepony/model/package-info.java
new file mode 100644
index 00000000..6dc6a541
--- /dev/null
+++ b/src/common/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/common/java/com/minelittlepony/package-info.java b/src/common/java/com/minelittlepony/package-info.java
new file mode 100644
index 00000000..a1d3fc42
--- /dev/null
+++ b/src/common/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/common/java/com/minelittlepony/pony/meta/package-info.java b/src/common/java/com/minelittlepony/pony/meta/package-info.java
new file mode 100644
index 00000000..8e62106e
--- /dev/null
+++ b/src/common/java/com/minelittlepony/pony/meta/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.pony.meta;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/common/java/com/minelittlepony/pony/package-info.java b/src/common/java/com/minelittlepony/pony/package-info.java
new file mode 100644
index 00000000..d971405b
--- /dev/null
+++ b/src/common/java/com/minelittlepony/pony/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.pony;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/common/java/com/minelittlepony/settings/package-info.java b/src/common/java/com/minelittlepony/settings/package-info.java
new file mode 100644
index 00000000..644ea348
--- /dev/null
+++ b/src/common/java/com/minelittlepony/settings/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.settings;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/common/java/com/minelittlepony/util/chron/package-info.java b/src/common/java/com/minelittlepony/util/chron/package-info.java
new file mode 100644
index 00000000..d3f32e34
--- /dev/null
+++ b/src/common/java/com/minelittlepony/util/chron/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.util.chron;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/common/java/com/minelittlepony/util/resources/package-info.java b/src/common/java/com/minelittlepony/util/resources/package-info.java
new file mode 100644
index 00000000..14d0aaa2
--- /dev/null
+++ b/src/common/java/com/minelittlepony/util/resources/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.util.resources;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/common/java/com/minelittlepony/util/transform/package-info.java b/src/common/java/com/minelittlepony/util/transform/package-info.java
new file mode 100644
index 00000000..34c49157
--- /dev/null
+++ b/src/common/java/com/minelittlepony/util/transform/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.util.transform;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/hdskins/java/com/minelittlepony/hdskins/ducks/package-info.java b/src/hdskins/java/com/minelittlepony/hdskins/ducks/package-info.java
new file mode 100644
index 00000000..24ad0ece
--- /dev/null
+++ b/src/hdskins/java/com/minelittlepony/hdskins/ducks/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.hdskins.ducks;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/hdskins/java/com/minelittlepony/hdskins/litemod/package-info.java b/src/hdskins/java/com/minelittlepony/hdskins/litemod/package-info.java
new file mode 100644
index 00000000..167f1f93
--- /dev/null
+++ b/src/hdskins/java/com/minelittlepony/hdskins/litemod/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.hdskins.litemod;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/hdskins/java/com/minelittlepony/hdskins/resources/texture/package-info.java b/src/hdskins/java/com/minelittlepony/hdskins/resources/texture/package-info.java
new file mode 100644
index 00000000..12789fb4
--- /dev/null
+++ b/src/hdskins/java/com/minelittlepony/hdskins/resources/texture/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.hdskins.resources.texture;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;
diff --git a/src/hdskins/java/com/minelittlepony/hdskins/util/package-info.java b/src/hdskins/java/com/minelittlepony/hdskins/util/package-info.java
new file mode 100644
index 00000000..d663a079
--- /dev/null
+++ b/src/hdskins/java/com/minelittlepony/hdskins/util/package-info.java
@@ -0,0 +1,7 @@
+@MethodsReturnNonnullByDefault
+@ParametersAreNonnullByDefault
+package com.minelittlepony.hdskins.util;
+
+import mcp.MethodsReturnNonnullByDefault;
+
+import javax.annotation.ParametersAreNonnullByDefault;