diff --git a/src/py/mat3ra/made/tools/build/grain_boundary/builders.py b/src/py/mat3ra/made/tools/build/grain_boundary/builders.py
index e4e4bdb9..4ac22f55 100644
--- a/src/py/mat3ra/made/tools/build/grain_boundary/builders.py
+++ b/src/py/mat3ra/made/tools/build/grain_boundary/builders.py
@@ -15,6 +15,15 @@ class GrainBoundaryBuilderParameters(ZSLStrainMatchingInterfaceBuilderParameters
 
 
 class GrainBoundaryBuilder(ZSLStrainMatchingInterfaceBuilder):
+    """
+    A builder for creating grain boundaries.
+
+    The grain boundary is created by:
+    1. creating an interface between two phases,
+    2. then rotating the interface by 90 degrees.
+    3. Finally, creating a slab from the rotated interface.
+    """
+
     _BuildParametersType = GrainBoundaryBuilderParameters
     _ConfigurationType: type(GrainBoundaryConfiguration) = GrainBoundaryConfiguration  # type: ignore
     _GeneratedItemType: type(Material) = Material  # type: ignore
diff --git a/src/py/mat3ra/made/tools/build/grain_boundary/configuration.py b/src/py/mat3ra/made/tools/build/grain_boundary/configuration.py
index 4fa5976d..37960ca2 100644
--- a/src/py/mat3ra/made/tools/build/grain_boundary/configuration.py
+++ b/src/py/mat3ra/made/tools/build/grain_boundary/configuration.py
@@ -5,6 +5,20 @@
 
 
 class GrainBoundaryConfiguration(BaseModel, InMemoryEntity):
+    """
+    Configuration for a grain boundary in a slab material.
+
+    Attributes:
+    phase_1_configuration: SlabConfiguration
+    phase_2_configuration: SlabConfiguration
+    phase_1_termination: Termination
+    phase_2_termination: Termination
+    gap: float
+    slab_configuration: SlabConfiguration
+    slab_termination
+
+    """
+
     phase_1_configuration: SlabConfiguration
     phase_2_configuration: SlabConfiguration
     phase_1_termination: Termination