diff --git a/core/index.go b/core/index.go
index 87b16dc..4619925 100644
--- a/core/index.go
+++ b/core/index.go
@@ -244,6 +244,7 @@ func (in *Index) RefreshFile(path string) error {
 
 // Write saves the index file
 func (in Index) Write() error {
+	// TODO: calculate and provide hash while writing?
 	f, err := os.Create(in.indexFile)
 	if err != nil {
 		return err
diff --git a/curseforge/curseforge.go b/curseforge/curseforge.go
index 848c26c..e9b7486 100644
--- a/curseforge/curseforge.go
+++ b/curseforge/curseforge.go
@@ -258,6 +258,14 @@ func cmdInstall(flags core.Flags, mod string, modArgsTail []string) error {
 	if err != nil {
 		return cli.NewExitError(err, 1)
 	}
+	err = pack.UpdateIndexHash()
+	if err != nil {
+		return cli.NewExitError(err, 1)
+	}
+	err = pack.Write()
+	if err != nil {
+		return cli.NewExitError(err, 1)
+	}
 
 	fmt.Printf("Mod \"%s\" successfully installed!\n", modInfoData.Name)
 
diff --git a/curseforge/import.go b/curseforge/import.go
index 81baa56..cfce9ad 100644
--- a/curseforge/import.go
+++ b/curseforge/import.go
@@ -100,12 +100,20 @@ func cmdImport(flags core.Flags, file string) error {
 		}
 	}
 
+	// TODO: import existing files (config etc.)
+
 	err = index.Write()
 	if err != nil {
 		return cli.NewExitError(err, 1)
 	}
-
-	// TODO: import existing files (config etc.)
+	err = pack.UpdateIndexHash()
+	if err != nil {
+		return cli.NewExitError(err, 1)
+	}
+	err = pack.Write()
+	if err != nil {
+		return cli.NewExitError(err, 1)
+	}
 
 	return nil
 }