diff --git a/CHANGELOG.md b/CHANGELOG.md
index b83e297bd..a72727b62 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Unreleased
 
 ### Added
+* Added `center_of_mass` property to Assembly class.
+* Added `volume` property to Assembly class.
 
 ### Changed
 
diff --git a/src/compas_timber/assembly/assembly.py b/src/compas_timber/assembly/assembly.py
index d31c9cc8a..304854664 100644
--- a/src/compas_timber/assembly/assembly.py
+++ b/src/compas_timber/assembly/assembly.py
@@ -218,12 +218,12 @@ def center_of_mass(self):
         for beam in self._beams:
             vol = beam.blank.volume
             point = beam.blank_frame.point
-            point += beam.blank_frame.xaxis * (beam.blank_length / 2) 
-            total_vol += vol 
+            point += beam.blank_frame.xaxis * (beam.blank_length / 2)
+            total_vol += vol
             total_position += point * vol
 
         return Point(*total_position) * (1.0 / total_vol)
-    
+
     @property
     def volume(self):
         """Returns the center of mass of the assembly.