diff --git a/textarea/memoization/memoization.go b/internal/memoization/memoization.go
similarity index 97%
rename from textarea/memoization/memoization.go
rename to internal/memoization/memoization.go
index ccb80a9..46c347a 100644
--- a/textarea/memoization/memoization.go
+++ b/internal/memoization/memoization.go
@@ -1,3 +1,5 @@
+// Package memoization implement a simple memoization cache. It's designed to
+// improve performance in textarea.
 package memoization
 
 import (
diff --git a/textarea/memoization/memoization_test.go b/internal/memoization/memoization_test.go
similarity index 100%
rename from textarea/memoization/memoization_test.go
rename to internal/memoization/memoization_test.go
diff --git a/runeutil/runeutil.go b/internal/runeutil/runeutil.go
similarity index 95%
rename from runeutil/runeutil.go
rename to internal/runeutil/runeutil.go
index 82ea90a..6856cc8 100644
--- a/runeutil/runeutil.go
+++ b/internal/runeutil/runeutil.go
@@ -1,5 +1,5 @@
-// Package runeutil provides a utility function for use in Bubbles
-// that can process Key messages containing runes.
+// Package runeutil provides utility functions for tidying up incoming runes
+// from Key messages.
 package runeutil
 
 import (
diff --git a/runeutil/runeutil_test.go b/internal/runeutil/runeutil_test.go
similarity index 100%
rename from runeutil/runeutil_test.go
rename to internal/runeutil/runeutil_test.go
diff --git a/textarea/textarea.go b/textarea/textarea.go
index 1ae9290..877737a 100644
--- a/textarea/textarea.go
+++ b/textarea/textarea.go
@@ -9,9 +9,9 @@ import (
 
 	"github.com/atotto/clipboard"
 	"github.com/charmbracelet/bubbles/v2/cursor"
+	"github.com/charmbracelet/bubbles/v2/internal/memoization"
+	"github.com/charmbracelet/bubbles/v2/internal/runeutil"
 	"github.com/charmbracelet/bubbles/v2/key"
-	"github.com/charmbracelet/bubbles/v2/runeutil"
-	"github.com/charmbracelet/bubbles/v2/textarea/memoization"
 	"github.com/charmbracelet/bubbles/v2/viewport"
 	tea "github.com/charmbracelet/bubbletea/v2"
 	"github.com/charmbracelet/lipgloss"
diff --git a/textinput/textinput.go b/textinput/textinput.go
index 2359d92..d550e23 100644
--- a/textinput/textinput.go
+++ b/textinput/textinput.go
@@ -7,8 +7,8 @@ import (
 
 	"github.com/atotto/clipboard"
 	"github.com/charmbracelet/bubbles/v2/cursor"
+	"github.com/charmbracelet/bubbles/v2/internal/runeutil"
 	"github.com/charmbracelet/bubbles/v2/key"
-	"github.com/charmbracelet/bubbles/v2/runeutil"
 	tea "github.com/charmbracelet/bubbletea/v2"
 	"github.com/charmbracelet/lipgloss"
 	rw "github.com/mattn/go-runewidth"