diff --git a/HISTORY.rst b/HISTORY.rst
index 4616975..dd63426 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -2,6 +2,13 @@
 History
 =======
 
+1.2.2 (2025-06-27)
+------------------
+
+* Expansion of the sample model language, see #140 for details.
+* Improve documentation (#132, #135)
+* Some bug fixes
+
 1.2.1 (2024-07-01)
 ------------------
 
diff --git a/orsopy/__init__.py b/orsopy/__init__.py
index 63c6ddf..fb35196 100644
--- a/orsopy/__init__.py
+++ b/orsopy/__init__.py
@@ -1,3 +1,3 @@
 """Top-level package for orsopy."""
 
-__version__ = "1.3.0"
+__version__ = "1.2.2"
diff --git a/orsopy/fileio/schema/refl_header.schema.json b/orsopy/fileio/schema/refl_header.schema.json
index a3b94ca..3787d47 100644
--- a/orsopy/fileio/schema/refl_header.schema.json
+++ b/orsopy/fileio/schema/refl_header.schema.json
@@ -838,208 +838,6 @@
       "title": "Layer",
       "type": "object"
     },
-    "LipidLeaflet": {
-      "properties": {
-        "apm": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "$ref": "#/$defs/Value"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "b_heads": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "$ref": "#/$defs/ComplexValue"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "vm_heads": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "$ref": "#/$defs/Value"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "b_tails": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "$ref": "#/$defs/ComplexValue"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "vm_tails": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "$ref": "#/$defs/Value"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "thickness_heads": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "$ref": "#/$defs/Value"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "roughness_head_tail": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "$ref": "#/$defs/Value"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "head_solvent": {
-          "anyOf": [
-            {
-              "$ref": "#/$defs/Material"
-            },
-            {
-              "$ref": "#/$defs/Composit"
-            },
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "tail_solvent": {
-          "anyOf": [
-            {
-              "$ref": "#/$defs/Material"
-            },
-            {
-              "$ref": "#/$defs/Composit"
-            },
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "thickness": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "$ref": "#/$defs/Value"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "roughness": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "$ref": "#/$defs/Value"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "reverse_monolayer": {
-          "anyOf": [
-            {
-              "type": "boolean"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": false
-        },
-        "sub_stack_class": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "const": "LipidLeaflet",
-          "default": "LipidLeaflet"
-        },
-        "comment": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        }
-      },
-      "required": [
-        "apm",
-        "b_heads",
-        "vm_heads",
-        "b_tails",
-        "vm_tails",
-        "thickness_heads"
-      ],
-      "title": "LipidLeaflet",
-      "type": "object"
-    },
     "Material": {
       "properties": {
         "formula": {
@@ -1652,9 +1450,6 @@
                   },
                   {
                     "$ref": "#/$defs/FunctionTwoElements"
-                  },
-                  {
-                    "$ref": "#/$defs/LipidLeaflet"
                   }
                 ]
               },
diff --git a/orsopy/fileio/schema/refl_header.schema.yaml b/orsopy/fileio/schema/refl_header.schema.yaml
index 892994e..fed32a8 100644
--- a/orsopy/fileio/schema/refl_header.schema.yaml
+++ b/orsopy/fileio/schema/refl_header.schema.yaml
@@ -425,95 +425,6 @@ $defs:
         default: null
     title: Layer
     type: object
-  LipidLeaflet:
-    properties:
-      apm:
-        anyOf:
-        - type: number
-        - $ref: '#/$defs/Value'
-        - type: 'null'
-      b_heads:
-        anyOf:
-        - type: number
-        - $ref: '#/$defs/ComplexValue'
-        - type: 'null'
-      b_tails:
-        anyOf:
-        - type: number
-        - $ref: '#/$defs/ComplexValue'
-        - type: 'null'
-      comment:
-        anyOf:
-        - type: string
-        - type: 'null'
-        default: null
-      head_solvent:
-        anyOf:
-        - $ref: '#/$defs/Material'
-        - $ref: '#/$defs/Composit'
-        - type: string
-        - type: 'null'
-        default: null
-      reverse_monolayer:
-        anyOf:
-        - type: boolean
-        - type: 'null'
-        default: false
-      roughness:
-        anyOf:
-        - type: number
-        - $ref: '#/$defs/Value'
-        - type: 'null'
-        default: null
-      roughness_head_tail:
-        anyOf:
-        - type: number
-        - $ref: '#/$defs/Value'
-        - type: 'null'
-        default: null
-      sub_stack_class:
-        anyOf:
-        - type: string
-        - type: 'null'
-        const: LipidLeaflet
-        default: LipidLeaflet
-      tail_solvent:
-        anyOf:
-        - $ref: '#/$defs/Material'
-        - $ref: '#/$defs/Composit'
-        - type: string
-        - type: 'null'
-        default: null
-      thickness:
-        anyOf:
-        - type: number
-        - $ref: '#/$defs/Value'
-        - type: 'null'
-        default: null
-      thickness_heads:
-        anyOf:
-        - type: number
-        - $ref: '#/$defs/Value'
-        - type: 'null'
-      vm_heads:
-        anyOf:
-        - type: number
-        - $ref: '#/$defs/Value'
-        - type: 'null'
-      vm_tails:
-        anyOf:
-        - type: number
-        - $ref: '#/$defs/Value'
-        - type: 'null'
-    required:
-    - apm
-    - b_heads
-    - vm_heads
-    - b_tails
-    - vm_tails
-    - thickness_heads
-    title: LipidLeaflet
-    type: object
   Material:
     properties:
       comment:
@@ -960,7 +871,6 @@ $defs:
             - $ref: '#/$defs/ItemChanger'
             - $ref: '#/$defs/SubStack'
             - $ref: '#/$defs/FunctionTwoElements'
-            - $ref: '#/$defs/LipidLeaflet'
           type: object
         - type: 'null'
         default: null