diff --git a/lib/stormpy/__init__.py b/lib/stormpy/__init__.py
index 28634cd..5c6d212 100644
--- a/lib/stormpy/__init__.py
+++ b/lib/stormpy/__init__.py
@@ -108,6 +108,13 @@ def build_parametric_model_from_drn(file):
 
 
 def perform_bisimulation(model, properties, bisimulation_type):
+    """
+    Perform bisimulation on model.
+    :param model: Model.
+    :param properties: Properties to preserve during bisimulation.
+    :param bisimulation_type: Type of bisimulation (weak or strong).
+    :return: Model after bisimulation.
+    """
     formulae = [prop.raw_formula for prop in properties]
     if model.supports_parameters:
         return core._perform_parametric_bisimulation(model, formulae, bisimulation_type)
@@ -116,6 +123,13 @@ def perform_bisimulation(model, properties, bisimulation_type):
 
 
 def model_checking(model, property):
+    """
+    Perform model checking on model for property.
+    :param model: Model.
+    :param property: Property to check for.
+    :return: Model checking result.
+    :rtype: CheckResult
+    """
     if model.supports_parameters:
         task = core.ParametricCheckTask(property.raw_formula, False)
         return core._parametric_model_checking_sparse_engine(model, task)
diff --git a/lib/stormpy/examples/__init__.py b/lib/stormpy/examples/__init__.py
index e69de29..94456ab 100644
--- a/lib/stormpy/examples/__init__.py
+++ b/lib/stormpy/examples/__init__.py
@@ -0,0 +1 @@
+# intentionally left blank
diff --git a/lib/stormpy/examples/files.py b/lib/stormpy/examples/files.py
index f825f91..0dffe66 100644
--- a/lib/stormpy/examples/files.py
+++ b/lib/stormpy/examples/files.py
@@ -4,7 +4,12 @@ testfile_dir = os.path.join(os.path.dirname(os.path.abspath(__file__)), "files")
 
 
 def _path(folder, file):
-    """Internal method for simpler listing of examples"""
+    """
+    Internal method for simpler listing of examples.
+    :param folder: Folder.
+    :param file: Example file.
+    :return: Complete path to example file.
+    """
     return os.path.join(testfile_dir, folder, file)
 
 
diff --git a/lib/stormpy/storage/__init__.py b/lib/stormpy/storage/__init__.py
index 08aeb77..a258a89 100644
--- a/lib/stormpy/storage/__init__.py
+++ b/lib/stormpy/storage/__init__.py
@@ -1,8 +1,17 @@
 from . import storage
 from .storage import *
 
+
 class ModelInstantiator:
+    """
+    Class for instantiating models.
+    """
+
     def __init__(self, model):
+        """
+        Constructor.
+        :param model: Model.
+        """
         if model.model_type == ModelType.MDP:
             self._instantiator = PmdpInstantiator(model)
         elif model.model_type == ModelType.DTMC:
@@ -14,5 +23,10 @@ class ModelInstantiator:
         else:
             raise ValueError("Model type {} not supported".format(model.model_type))
 
-    def instantiate(self, point):
-        return self._instantiator.instantiate(point)
+    def instantiate(self, valuation):
+        """
+        Instantiate model with given valuation.
+        :param valuation: Valuation from parameter to value.
+        :return: Instantiated model.
+        """
+        return self._instantiator.instantiate(valuation)
diff --git a/lib/stormpy/utility/__init__.py b/lib/stormpy/utility/__init__.py
index bdc2591..3bdf0e7 100644
--- a/lib/stormpy/utility/__init__.py
+++ b/lib/stormpy/utility/__init__.py
@@ -1,2 +1,2 @@
 from . import utility
-from .utility import *
\ No newline at end of file
+from .utility import *