1 files changed, 14 insertions, 3 deletions
diff --git a/packages/gitbook-core/src/reducers/navigation.js b/packages/gitbook-core/src/reducers/navigation.js
index a895186..625adef 100644
--- a/packages/gitbook-core/src/reducers/navigation.js
+++ b/packages/gitbook-core/src/reducers/navigation.js
@@ -1,9 +1,15 @@
-const { Record } = require('immutable');
+const { Record, Map } = require('immutable');
 const ACTION_TYPES = require('../actions/TYPES');
 
 const NavigationState = Record({
-    loading: false,
-    error:   null
+    // Are we loading a new page
+    loading: Boolean(false),
+    // Did we fail loading a page?
+    error:   null,
+    // Query string
+    query:   Map(),
+    // Current anchor
+    anchor:  String('')
 });
 
 function reduceNavigation(state, action) {
@@ -26,6 +32,11 @@ function reduceNavigation(state, action) {
             error:   action.error
         });
 
+    case ACTION_TYPES.PAGE_UPDATE_ANCHOR:
+        return state.merge({
+            anchor: action.anchor
+        });
+
     default:
         return state;