diff --git a/CHANGELOG.md b/CHANGELOG.md
index 133bef32..e43a6dd3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Added `Element.compute_elementgeometry()`.
 * Added `Element.compute_modelgeometry()` to replace `Element.compute_geometry()`.
 * Added `Element.compute_modeltransformation()` to replace `Element.compute_worldtransformation()`.
+* Added `Element.is_dirty`.
 
 ### Changed
 
diff --git a/src/compas_model/elements/element.py b/src/compas_model/elements/element.py
index 7012d2f7..59959a51 100644
--- a/src/compas_model/elements/element.py
+++ b/src/compas_model/elements/element.py
@@ -93,6 +93,8 @@ class Element(Data):
         Scaling factor to inflate the AABB with.
     inflate_obb : float
         Scaling factor to inflate the OBB with.
+    is_dirty : bool
+        Flag to indicate that modelgeometry has to be recomputed.
 
     """
 
@@ -140,6 +142,8 @@ def __init__(
         self.include_features = False
         self.inflate_aabb = 0.0
         self.inflate_obb = 0.0
+        
+        self._is_dirty = True
 
     # this is not entirely correct
     def __repr__(self) -> str: