diff --git a/src/main/java/link/infra/packwiz/installer/UpdateManager.java b/src/main/java/link/infra/packwiz/installer/UpdateManager.java
index 6750220..05c9446 100644
--- a/src/main/java/link/infra/packwiz/installer/UpdateManager.java
+++ b/src/main/java/link/infra/packwiz/installer/UpdateManager.java
@@ -12,6 +12,7 @@ import java.nio.file.Paths;
 import com.google.gson.Gson;
 import com.google.gson.JsonIOException;
 import com.google.gson.JsonSyntaxException;
+import com.google.gson.annotations.SerializedName;
 import com.moandjiezana.toml.Toml;
 
 import link.infra.packwiz.installer.metadata.ManifestFile;
@@ -33,7 +34,12 @@ public class UpdateManager {
 		public Side side = Side.CLIENT;
 
 		public static enum Side {
-			CLIENT("client"), SERVER("server"), BOTH("both", new Side[] { CLIENT, SERVER });
+			@SerializedName("client")
+			CLIENT("client"),
+			@SerializedName("server")
+			SERVER("server"),
+			@SerializedName("both")
+			BOTH("both", new Side[] { CLIENT, SERVER });
 
 			private final String sideName;
 			private final Side[] depSides;
diff --git a/src/main/java/link/infra/packwiz/installer/metadata/IndexFile.java b/src/main/java/link/infra/packwiz/installer/metadata/IndexFile.java
index dd7cca0..b14cdb6 100644
--- a/src/main/java/link/infra/packwiz/installer/metadata/IndexFile.java
+++ b/src/main/java/link/infra/packwiz/installer/metadata/IndexFile.java
@@ -14,5 +14,8 @@ public class IndexFile {
 		@SerializedName("hash-format")
 		public String hashFormat;
 		public String hash;
+		public String alias;
+		public boolean metafile;
+		public boolean preserve;
 	}
 }
\ No newline at end of file
diff --git a/src/main/java/link/infra/packwiz/installer/metadata/ModFile.java b/src/main/java/link/infra/packwiz/installer/metadata/ModFile.java
new file mode 100644
index 0000000..1795b20
--- /dev/null
+++ b/src/main/java/link/infra/packwiz/installer/metadata/ModFile.java
@@ -0,0 +1,33 @@
+package link.infra.packwiz.installer.metadata;
+
+import java.net.URI;
+import java.util.Map;
+
+import com.google.gson.annotations.SerializedName;
+
+import link.infra.packwiz.installer.UpdateManager.Options.Side;
+
+class ModFile {
+	public String name;
+	public String filename;
+	public Side side;
+
+	public Download download;
+	public static class Download {
+		public URI url;
+		@SerializedName("hash-format")
+		public String hashFormat;
+		public String hash;
+	}
+
+	public Map<String, Object> update;
+
+	public Option option;
+	public static class Option {
+		public boolean optional;
+		public String description;
+		@SerializedName("default")
+		public boolean defaultValue;
+	}
+
+}
\ No newline at end of file