diff --git a/src/content/actions/index.js b/src/content/actions/index.js
index 6976df7..0a16fdf 100644
--- a/src/content/actions/index.js
+++ b/src/content/actions/index.js
@@ -22,4 +22,10 @@ export default {
 
   // Find
   FIND_SET_KEYWORD: 'find.set.keyword',
+
+  // Mark
+  MARK_START_SET: 'mark.start.set',
+  MARK_START_JUMP: 'mark.start.jump',
+  MARK_CANCEL: 'mark.cancel',
+  MARK_SET_LOCAL: 'mark.set.local',
 };
diff --git a/src/content/actions/mark.js b/src/content/actions/mark.js
new file mode 100644
index 0000000..baf5825
--- /dev/null
+++ b/src/content/actions/mark.js
@@ -0,0 +1,25 @@
+import actions from 'content/actions';
+
+const startSet = () => {
+  return { type: actions.MARK_START_SET };
+};
+
+const startJump = () => {
+  return { type: actions.MARK_START_JUMP };
+};
+
+const cancel = () => {
+  return { type: actions.MARK_CANCEL };
+};
+
+const setLocal = (key, y) => {
+  return {
+    type: actions.MARK_SET_LOCAL,
+    key,
+    y,
+  };
+};
+
+export {
+  startSet, startJump, cancel, setLocal,
+};
diff --git a/src/content/reducers/mark.js b/src/content/reducers/mark.js
new file mode 100644
index 0000000..b6a071f
--- /dev/null
+++ b/src/content/reducers/mark.js
@@ -0,0 +1,25 @@
+import actions from 'content/actions';
+
+const defaultState = {
+  set: false,
+  jump: false,
+  marks: {},
+};
+
+export default function reducer(state = defaultState, action = {}) {
+  switch (action.type) {
+  case actions.MARK_START_SET:
+    return { ...state, set: true };
+  case actions.MARK_START_JUMP:
+    return { ...state, jump: true };
+  case actions.MARK_CANCEL:
+    return { ...state, set: false, jump: false };
+  case actions.MARK_SET_LOCAL: {
+    let marks = { ...state.marks };
+    marks[action.key] = { y: action.y };
+    return { ...state, marks };
+  }
+  default:
+    return state;
+  }
+}
diff --git a/test/content/actions/mark.test.js b/test/content/actions/mark.test.js
new file mode 100644
index 0000000..47d31cd
--- /dev/null
+++ b/test/content/actions/mark.test.js
@@ -0,0 +1,34 @@
+import actions from 'content/actions';
+import * as markActions from 'content/actions/mark';
+
+describe('mark actions', () => {
+  describe('startSet', () => {
+    it('create MARK_START_SET action', () => {
+      let action = markActions.startSet();
+      expect(action.type).to.equal(actions.MARK_START_SET);
+    });
+  });
+
+  describe('startJump', () => {
+    it('create MARK_START_JUMP action', () => {
+      let action = markActions.startJump();
+      expect(action.type).to.equal(actions.MARK_START_JUMP);
+    });
+  });
+
+  describe('cancel', () => {
+    it('create MARK_CANCEL action', () => {
+      let action = markActions.cancel();
+      expect(action.type).to.equal(actions.MARK_CANCEL);
+    });
+  });
+
+  describe('setLocal', () => {
+    it('create setLocal action', () => {
+      let action = markActions.setLocal('a', 30);
+      expect(action.type).to.equal(actions.MARK_SET_LOCAL);
+      expect(action.key).to.equal('a');
+      expect(action.y).to.equal(30);
+    });
+  });
+});
diff --git a/test/content/reducers/mark.test.js b/test/content/reducers/mark.test.js
new file mode 100644
index 0000000..39c04cd
--- /dev/null
+++ b/test/content/reducers/mark.test.js
@@ -0,0 +1,39 @@
+import actions from 'content/actions';
+import reducer from 'content/reducers/mark';
+
+describe("mark reducer", () => {
+  it('return the initial state', () => {
+    let state = reducer(undefined, {});
+    expect(state.set).to.be.false;
+    expect(state.jump).to.be.false;
+    expect(state.marks).to.be.empty;
+  });
+
+  it('starts set mode', () => {
+    let action = { type: actions.MARK_START_SET };
+    let state = reducer(undefined, action);
+    expect(state.set).to.be.true;
+  });
+
+  it('starts jump mode', () => {
+    let action = { type: actions.MARK_START_JUMP };
+    let state = reducer(undefined, action);
+    expect(state.jump).to.be.true;
+  });
+
+  it('cancels set and jump mode', () => {
+    let action = { type: actions.MARK_CANCEL };
+    let state = reducer({ set: true }, action);
+    expect(state.set).to.be.false;
+
+    state = reducer({ jump: true }, action);
+    expect(state.jump).to.be.false;
+  });
+
+  it('stores local mark', () => {
+    let action = { type: actions.MARK_SET_LOCAL, key: 'a', y: 10 };
+    let state = reducer(undefined, action);
+    expect(state.marks['a']).to.be.an('object')
+    expect(state.marks['a'].y).to.equal(10)
+  });
+});