diff --git a/egui/src/demos/app.rs b/egui/src/demos/app.rs
index ad810bad..099e6eb6 100644
--- a/egui/src/demos/app.rs
+++ b/egui/src/demos/app.rs
@@ -1,4 +1,4 @@
-use crate::{app, demos, Context, History, Ui};
+use crate::{app, demos, util::History, Context, Ui};
 use std::sync::Arc;
 
 // ----------------------------------------------------------------------------
diff --git a/egui/src/input.rs b/egui/src/input.rs
index 10d95c4d..ff987310 100644
--- a/egui/src/input.rs
+++ b/egui/src/input.rs
@@ -1,6 +1,6 @@
 //! The input needed by Egui.
 
-use crate::{math::*, History};
+use crate::{math::*, util::History};
 
 /// If mouse moves more than this, it is no longer a click (but maybe a drag)
 const MAX_CLICK_DIST: f32 = 6.0;
diff --git a/egui/src/lib.rs b/egui/src/lib.rs
index 06373138..c2292ce8 100644
--- a/egui/src/lib.rs
+++ b/egui/src/lib.rs
@@ -60,11 +60,9 @@
 pub mod align;
 mod animation_manager;
 pub mod app;
-pub(crate) mod cache;
 pub mod containers;
 mod context;
 pub mod demos;
-mod history;
 mod id;
 mod input;
 mod introspection;
@@ -73,12 +71,12 @@ mod layout;
 pub mod math;
 mod memory;
 pub mod menu;
-pub mod mutex;
 pub mod paint;
 mod painter;
 mod style;
 mod types;
 mod ui;
+pub mod util;
 pub mod widgets;
 
 pub use {
@@ -86,7 +84,6 @@ pub use {
     containers::*,
     context::Context,
     demos::DemoApp,
-    history::History,
     id::Id,
     input::*,
     layers::*,
@@ -101,6 +98,7 @@ pub use {
     style::Style,
     types::*,
     ui::Ui,
+    util::mutex,
     widgets::*,
 };
 
diff --git a/egui/src/memory.rs b/egui/src/memory.rs
index ac912279..a1dcafcd 100644
--- a/egui/src/memory.rs
+++ b/egui/src/memory.rs
@@ -1,11 +1,10 @@
 use std::collections::{HashMap, HashSet};
 
 use crate::{
-    area,
-    cache::Cache,
-    collapsing_header, menu,
+    area, collapsing_header, menu,
     paint::color::{Hsva, Srgba},
     resize, scroll_area,
+    util::Cache,
     widgets::text_edit,
     window, Id, LayerId, Pos2, Rect,
 };
diff --git a/egui/src/cache.rs b/egui/src/util/cache.rs
similarity index 100%
rename from egui/src/cache.rs
rename to egui/src/util/cache.rs
diff --git a/egui/src/history.rs b/egui/src/util/history.rs
similarity index 100%
rename from egui/src/history.rs
rename to egui/src/util/history.rs
diff --git a/egui/src/util/mod.rs b/egui/src/util/mod.rs
new file mode 100644
index 00000000..f982d99d
--- /dev/null
+++ b/egui/src/util/mod.rs
@@ -0,0 +1,8 @@
+//! Tools used by Egui, but that doesn't depend on anything in Egui.
+
+pub(crate) mod cache;
+mod history;
+pub mod mutex;
+
+pub(crate) use cache::Cache;
+pub use history::History;
diff --git a/egui/src/mutex.rs b/egui/src/util/mutex.rs
similarity index 100%
rename from egui/src/mutex.rs
rename to egui/src/util/mutex.rs