diff --git a/docs/source/changelog.md b/docs/source/changelog.md
index fecd5aa..857397f 100644
--- a/docs/source/changelog.md
+++ b/docs/source/changelog.md
@@ -28,6 +28,7 @@
         - `offset` changed sign, it's now the time at which the first beat occurs in the audio file, instead of its opposite
         - `offset` now has an implicit default value of 0 in case no timing object in the file defines it
         - BPM changes can now be stored in the `bpms` array !
+        - `hakus` allow storing special background bounce patterns
 - **Removed**
     - In the metadata object :
         - `preview path` is now replaced with the polymorphic `preview`
diff --git a/docs/source/other-things.md b/docs/source/other-things.md
index 3cdf76e..32959fc 100644
--- a/docs/source/other-things.md
+++ b/docs/source/other-things.md
@@ -114,6 +114,11 @@ For example, in this case :
 
 The BPM on beat zero is set to 124
 
+### Duplicate HAKUs
+
+The schema allows of duplicate hakus, implementations should deduplicate hakus by beat.
+
+
 (multiple-timing-objects)=
 ### Multiple Timing Objects
 
diff --git a/docs/source/schema.md b/docs/source/schema.md
index 1dec6ab..4ff37d1 100644
--- a/docs/source/schema.md
+++ b/docs/source/schema.md
@@ -89,7 +89,8 @@ Describes the part of the music file that's meant to be played on loop when prev
 {
     "offset": 0,
     "resolution": 240,
-    "bpms": []
+    "bpms": [],
+    "hakus": []
 }
 ```
 
@@ -115,6 +116,10 @@ Describes the relationship between seconds in the audio file and symbolic time (
         ```
 
     - Array of [BPM events](#bpm)
+- **hakus**
+    - array, optional
+    - If the key is missing, default to the regular background bounce pattern
+    - HAKUs (named after the `HAKU` command in .eve files) describe how the background animation should bounce along with the music, most songs just leave a default regular patterns that makes the background bounce on every beat, but some songs use these commands as a gimmick. In that sense they are similar to beat lines in BMS
 
 Timing objects can appear in multiple places in a memon file. The section [](other-things.md#multiple-timing-objects) explains how to deal with them.
 
@@ -240,7 +245,7 @@ A classic long note, with a tail
     - Integer between 0 and 5 inclusive
     - Tail starting position in 6-notation :
 
-      For every given button on the controler, there are 6 possible starting
+      For every given button on the controller, there are 6 possible starting
       positions for long note tails.
 
       For example if the long note is held here :
diff --git a/schema.json b/schema.json
index a9127e3..e73e082 100644
--- a/schema.json
+++ b/schema.json
@@ -230,7 +230,7 @@
                     "$ref": "#/$defs/decimal"
                 },
                 "resolution": {
-                    "description": "Number of ticks in a beat for the bpm events",
+                    "description": "Number of ticks in a beat for the bpms and the hakus",
                     "type": "integer",
                     "minimum": 1,
                     "default": 240
@@ -255,6 +255,13 @@
                         "required": ["beat", "bpm"]
                     },
                     "default": [{"beat": 0, "bpm": 120}]
+                },
+                "hakus": {
+                    "description": "Array of HAKUs, dictates how the background should bounce if the bouncing pattern differs from the usual 4/4",
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/$defs/timeInBeats"
+                    }
                 }
             }
         }
diff --git a/tests/data/09 - hakus/fail/not a symbolic time.json b/tests/data/09 - hakus/fail/not a symbolic time.json
new file mode 100644
index 0000000..9d4e9bd
--- /dev/null
+++ b/tests/data/09 - hakus/fail/not a symbolic time.json	
@@ -0,0 +1,7 @@
+{
+    "version": "1.0.0",
+    "timing": {
+        "hakus": ["0.1", "0.2"]
+    },
+    "data": {}
+}
\ No newline at end of file
diff --git a/tests/data/09 - hakus/pass/hakus in a chart timing object.json b/tests/data/09 - hakus/pass/hakus in a chart timing object.json
new file mode 100644
index 0000000..76db915
--- /dev/null
+++ b/tests/data/09 - hakus/pass/hakus in a chart timing object.json	
@@ -0,0 +1,11 @@
+{
+    "version": "1.0.0",
+    "data": {
+        "a chart": {
+            "timing": {
+                "hakus": [0, 1, 2, 3]
+            },
+            "notes": []
+        }
+    }
+}
\ No newline at end of file
diff --git a/tests/data/09 - hakus/pass/hakus in the root timing object copy.json b/tests/data/09 - hakus/pass/hakus in the root timing object copy.json
new file mode 100644
index 0000000..7ecbd5f
--- /dev/null
+++ b/tests/data/09 - hakus/pass/hakus in the root timing object copy.json	
@@ -0,0 +1,7 @@
+{
+    "version": "1.0.0",
+    "timing": {
+        "hakus": [0, 1, 2, 3]
+    },
+    "data": {}
+}
\ No newline at end of file
diff --git a/tests/data/09 - hakus/pass/hakus with mixed numbers.json b/tests/data/09 - hakus/pass/hakus with mixed numbers.json
new file mode 100644
index 0000000..63de980
--- /dev/null
+++ b/tests/data/09 - hakus/pass/hakus with mixed numbers.json	
@@ -0,0 +1,12 @@
+{
+    "version": "1.0.0",
+    "timing": {
+        "hakus": [
+            [1, 0, 1],
+            [2, 0, 1],
+            [3, 0, 1],
+            4
+        ]
+    },
+    "data": {}
+}
\ No newline at end of file