diff --git a/MANIFEST.MF b/MANIFEST.MF
new file mode 100644
index 000000000..fab265cb7
--- /dev/null
+++ b/MANIFEST.MF
@@ -0,0 +1,6 @@
+Manifest-Version: 1.0
+Ant-Version: Apache Ant 1.8.2
+Created-By: 1.7.0_09-b30 (Oracle Corporation)
+Main-Class: net.minecraft.server.MinecraftServer
+Class-Path: minecraft_server.jar
+
diff --git a/fml-src-3.1.48.399.zip b/fml-src-3.1.50.400.zip
similarity index 97%
rename from fml-src-3.1.48.399.zip
rename to fml-src-3.1.50.400.zip
index 31bfeb2d1..a4ac7df20 100644
Binary files a/fml-src-3.1.48.399.zip and b/fml-src-3.1.50.400.zip differ
diff --git a/release.py b/release.py
index 938bab37a..457689858 100644
--- a/release.py
+++ b/release.py
@@ -80,6 +80,7 @@ def main():
     zip_add('install/Paulscode SoundSystem CodecIBXM License.txt')
     zip_add('common/forge_at.cfg')
     zip_add(version_file)
+    zip_add('MANIFEST.MF','META-INF/MANIFEST.MF')
     zip_end()
     
     inject_version(os.path.join(forge_dir, 'common/net/minecraftforge/common/ForgeVersion.java'.replace('/', os.sep)), build_num)