diff --git a/README.md b/README.md
index 3b1d6e0..2b8db7d 100644
--- a/README.md
+++ b/README.md
@@ -303,7 +303,7 @@ this. The table below gives an overview.
 | Outer    | Inner    | Function                   |
 | -------- | -------- | -------------------------- |
 | Behavior | anything | `sample` (when inside Now) |
-| Behavior | Behavior | `flatten`                  |
+| Behavior | Behavior | `flat`                     |
 | Behavior | Stream   | `shiftCurrent`             |
 | Stream   | Behavior | `switcher`, `selfie`       |
 | Stream   | Stream   | `shift`                    |
diff --git a/src/behavior.ts b/src/behavior.ts
index f1f561b..627832f 100644
--- a/src/behavior.ts
+++ b/src/behavior.ts
@@ -57,7 +57,7 @@ export abstract class Behavior<A> extends Reactive<A, BListener>
   chain<B>(fn: (a: A) => Behavior<B>): Behavior<B> {
     return new FlatMapBehavior(this, fn);
   }
-  flatten<B>(this: Behavior<Behavior<B>>): Behavior<B> {
+  flat<B>(this: Behavior<Behavior<B>>): Behavior<B> {
     return new FlatMapBehavior(this, (a) => a);
   }
   at(t?: number): A {
diff --git a/src/future.ts b/src/future.ts
index dbcf5c5..7e7ce99 100644
--- a/src/future.ts
+++ b/src/future.ts
@@ -81,7 +81,7 @@ export abstract class Future<A> extends Reactive<A, SListener<A>>
   chain<B>(f: (a: A) => Future<B>): Future<B> {
     return new FlatMapFuture(f, this);
   }
-  flatten<B>(this: Future<Future<B>>): Future<B> {
+  flat<B>(this: Future<Future<B>>): Future<B> {
     return new FlatMapFuture((f) => f, this);
   }
 }
diff --git a/src/index.ts b/src/index.ts
index f4e1900..22d9ed2 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -54,11 +54,11 @@ export function lift<R>(f: (...args: any) => R, ...args: any): any {
   return args[0].lift(f, ...args);
 }
 
-export function flatten<A>(b: Behavior<Behavior<A>>): Behavior<A>;
-export function flatten<A>(f: Future<Future<A>>): Future<A>;
-export function flatten<A>(n: Now<Now<A>>): Now<A>;
-export function flatten(o: { flatten: () => any }): any {
-  return o.flatten();
+export function flat<A>(b: Behavior<Behavior<A>>): Behavior<A>;
+export function flat<A>(f: Future<Future<A>>): Future<A>;
+export function flat<A>(n: Now<Now<A>>): Now<A>;
+export function flat(o: { flat: () => any }): any {
+  return o.flat();
 }
 
 export function push<A>(a: A, sink: SinkBehavior<A> | SinkStream<A>): void {
diff --git a/src/now.ts b/src/now.ts
index 13a3b1d..32e8eb1 100644
--- a/src/now.ts
+++ b/src/now.ts
@@ -38,7 +38,7 @@ export abstract class Now<A> {
   chain<B>(f: (a: A) => Now<B>): Now<B> {
     return new FlatMapNow(this, f);
   }
-  flatten<B>(this: Now<Now<B>>): Now<B> {
+  flat<B>(this: Now<Now<B>>): Now<B> {
     return new FlatMapNow(this, (n) => n);
   }
   ap<B>(a: Now<(a: A) => B>): Now<B> {
diff --git a/test/animation.ts b/test/animation.ts
index 0e01395..f0c672e 100644
--- a/test/animation.ts
+++ b/test/animation.ts
@@ -16,7 +16,7 @@ describe("animation", () => {
         duration: 100
       };
 
-      const t = transitionBehavior(config, 0, target, time).flatten();
+      const t = transitionBehavior(config, 0, target, time).flat();
       t.subscribe(() => "");
       assert.strictEqual(at(t), 0);
       time.push(10);
diff --git a/test/behavior.ts b/test/behavior.ts
index bd42d6b..42043b8 100644
--- a/test/behavior.ts
+++ b/test/behavior.ts
@@ -411,10 +411,10 @@ describe("behavior", () => {
       assert.deepEqual(cb.args, [[2], [14]]);
     });
   });
-  describe("flatten", () => {
+  describe("flat", () => {
     it("has proper type", () => {
       const b = Behavior.of(Behavior.of("foo"));
-      H.flatten(b).map((s) => s + "bar");
+      H.flat(b).map((s) => s + "bar");
     });
   });
   describe("integrateFrom", () => {
@@ -972,7 +972,7 @@ describe("Behavior and Stream", () => {
       let variable = -1;
       const pullingB = H.fromFunction(() => variable);
       const outer = sinkBehavior<Behavior<number>>(pushingB);
-      const flattened = H.flatten(outer);
+      const flattened = H.flat(outer);
       const pushSpy = spy();
       let pull: () => void;
       const handlePulling = (p) => {
diff --git a/test/future.ts b/test/future.ts
index 48751e4..f58a810 100644
--- a/test/future.ts
+++ b/test/future.ts
@@ -186,11 +186,11 @@ describe("Future", () => {
       assert.deepEqual(result, [1, 2]);
     });
   });
-  describe("flatten", () => {
+  describe("flat", () => {
     it("resolves when inner occurs last", () => {
       const outer = sinkFuture<Future<number>>();
       const inner = sinkFuture<number>();
-      const flattened = H.flatten(outer);
+      const flattened = H.flat(outer);
       const cb = spy();
       flattened.subscribe(cb);
       outer.resolve(inner);
diff --git a/test/now.ts b/test/now.ts
index 2410a25..f3debdb 100644
--- a/test/now.ts
+++ b/test/now.ts
@@ -73,7 +73,7 @@ describe("Now", () => {
       assert.strictEqual(ref2.ref, "World");
     });
     it("can flatten pure nows", () => {
-      assert.strictEqual(runNow(Now.of(Now.of(12)).flatten()), 12);
+      assert.strictEqual(runNow(Now.of(Now.of(12)).flat()), 12);
     });
     it("throws in go if incorrect monad is yielded", (done) => {
       const now = go(