diff --git a/core/index.go b/core/index.go
index 9a8bc95..4aa3fbb 100644
--- a/core/index.go
+++ b/core/index.go
@@ -1 +1,34 @@
 package core
+// Index is a representation of the index.toml file for referencing all the files in a pack.
+type Index struct {
+	HashFormat string `toml:"hash-format"`
+	Files      []struct {
+		File       string `toml:"file"`
+		Hash       string `toml:"hash"`
+		HashFormat string `toml:"hash-format,omitempty"`
+		Alias      string `toml:"alias,omitempty"`
+	} `toml:"files"`
+}
+
+// LoadIndex loads the index file
+func LoadIndex(flags Flags) (Index, error) {
+	indexFile, err := ResolveIndex(flags)
+	if err != nil {
+		return Index{}, err
+	}
+
+	_ = indexFile // TODO finish
+	return Index{}, nil
+}
+
+// RemoveFile removes a file from the index.
+func (in Index) RemoveFile(path string) {
+	newFiles := in.Files[:0]
+	for _, v := range in.Files {
+		if v.File != path {
+			newFiles = append(newFiles, v)
+		}
+	}
+	in.Files = newFiles
+}
+
diff --git a/core/mod.go b/core/mod.go
index 90e9dd5..f9e6e87 100644
--- a/core/mod.go
+++ b/core/mod.go
@@ -1,21 +1,21 @@
 package core
-
 import "github.com/BurntSushi/toml"
 
 // Mod stores metadata about a mod. This is written to a TOML file for each mod.
 type Mod struct {
-	metaFilename string
-	Name     string `toml:"name"`
-	FileName string `toml:"filename"`
-	Side     string `toml:"side"`
-	Optional bool   `toml:"optional"`
-	Download struct {
+	metaFilename string // The filename for the metadata file, used as an ID
+	Name         string `toml:"name"`
+	FileName     string `toml:"filename"`
+	Side         string `toml:"side,omitempty"`
+	Optional     bool   `toml:"optional,omitempty"`
+	Download     struct {
 		URL        string `toml:"url"`
 		HashFormat string `toml:"hash-format"`
 		Hash       string `toml:"hash"`
 	} `toml:"download"`
-	Update map[string]toml.Primitive
+	Update map[string]toml.Primitive `toml:"update"`
 }
+
 // The three possible values of Side (the side that the mod is on) are "server", "client", and "both".
 const (
 	ServerSide    = "server"
diff --git a/core/pack.go b/core/pack.go
new file mode 100644
index 0000000..12f94a7
--- /dev/null
+++ b/core/pack.go
@@ -0,0 +1,27 @@
+package core
+import (
+	"fmt"
+
+	"github.com/BurntSushi/toml"
+)
+
+// Pack stores the modpack metadata, usually in pack.toml
+type Pack struct {
+	Name  string `toml:"name"`
+	Index struct {
+		File       string `toml:"file"`
+		HashFormat string `toml:"hash-format"`
+		Hash       string `toml:"hash"`
+	} `toml:"index"`
+	Versions map[string]string         `toml:"versions"`
+	Client   map[string]toml.Primitive `toml:"client"`
+	Server   map[string]toml.Primitive `toml:"server"`
+}
+
+// LoadPack loads the modpack metadata to a Pack struct
+func LoadPack(flags Flags) (Pack, error) {
+	fmt.Println(flags.PackFile)
+	// TODO implement
+	return Pack{}, nil
+}
+
diff --git a/core/resolve.go b/core/resolve.go
index 745edf6..f2d5341 100644
--- a/core/resolve.go
+++ b/core/resolve.go
@@ -13,3 +13,15 @@ func ResolveMod(modName string, flags Flags) string {
 	return filepath.Join(flags.ModsFolder, fileName)
 }
 
+// ResolveIndex returns the path to the index file
+func ResolveIndex(flags Flags) (string, error) {
+	pack, err := LoadPack(flags)
+	if err != nil {
+		return "", err
+	}
+	if filepath.IsAbs(pack.Index.File) {
+		return pack.Index.File, nil
+	}
+	return filepath.Join(flags.PackFile, pack.Index.File), nil
+}
+
diff --git a/main.go b/main.go
index d63be0f..0a64204 100644
--- a/main.go
+++ b/main.go
@@ -13,19 +13,25 @@ import (
 
 func init() {
 	core.Commands = append(core.Commands, cli.Command{
-		Name:    "delete",
-		Aliases: []string{"remove"},
-		Usage:   "Delete a mod from the modpack",
+		Name:    "remove",
+		Aliases: []string{"delete", "uninstall"},
+		Usage:   "Remove a mod from the modpack",
 		Action: func(c *cli.Context) error {
-			cmdDelete(core.FlagsFromContext(c))
+			return cmdDelete(core.FlagsFromContext(c))
+		},
+	}, cli.Command{
+		Name:    "update",
+		Aliases: []string{"upgrade"},
+		Usage:   "Update a mod (or all mods) in the modpack",
+		Action: func(c *cli.Context) error {
+			// TODO: implement
 			return nil
 		},
 	}, cli.Command{
-		Name:    "delet",
-		Aliases: []string{"remov"},
-		Usage:   "Delete a mod from the modpack",
+		Name:  "refresh",
+		Usage: "Refresh the index file",
 		Action: func(c *cli.Context) error {
-			cmdDelete(core.FlagsFromContext(c))
+			// TODO: implement
 			return nil
 		},
 	})
@@ -44,14 +50,14 @@ func main() {
 	}
 }
 
-func cmdDelete(flags core.Flags) {
+func cmdDelete(flags core.Flags) error {
 	mod := "demagnetize"
 	err := os.Remove(core.ResolveMod(mod, flags))
 	if err != nil {
-		fmt.Printf("Error removing mod: %s", err)
-	} else {
-		fmt.Printf("Mod %s removed successfully!", mod)
+		return cli.NewExitError(err, 1)
 	}
+	fmt.Printf("Mod %s removed successfully!", mod)
 	// TODO: update index
+	return nil
 }