diff --git a/src/TensorFlowNET.Core/Graphs/Graph.Operation.cs b/src/TensorFlowNET.Core/Graphs/Graph.Operation.cs
index 883f2b64..2d099292 100644
--- a/src/TensorFlowNET.Core/Graphs/Graph.Operation.cs
+++ b/src/TensorFlowNET.Core/Graphs/Graph.Operation.cs
@@ -21,8 +21,14 @@ namespace Tensorflow
         public OperationDescription NewOperation(string opType, string opName)
         {
             return c_api.TF_NewOperation(_handle, opType, opName);
-        }
-
+        }
+
+        /// <summary>
+        /// Returns the `Operation` with the given `name`.
+        /// 
+        /// This method may be called concurrently from multiple threads.
+        /// </summary>
+        /// <param name="name">The name of the `Operation` to return.</param>
         public Operation get_operation_by_name(string name) 
             => as_graph_element(name, allow_tensor: false, allow_operation: true) as Operation;
 
diff --git a/src/TensorFlowNET.Core/Graphs/_ControlDependenciesController.cs b/src/TensorFlowNET.Core/Graphs/_ControlDependenciesController.cs
index 3887d2a1..8def1417 100644
--- a/src/TensorFlowNET.Core/Graphs/_ControlDependenciesController.cs
+++ b/src/TensorFlowNET.Core/Graphs/_ControlDependenciesController.cs
@@ -17,8 +17,29 @@ namespace Tensorflow
         private bool _new_stack;
         private IControlFlowContext _old_control_flow_context;
 
-        public ITensorOrOperation[] control_inputs => _control_inputs_val.ToArray();
-
+        public ITensorOrOperation[] control_inputs => _control_inputs_val.ToArray();
+
+        /// <summary>
+        /// Create a new `_ControlDependenciesController`.
+        /// 
+        /// A `_ControlDependenciesController` is the context manager for
+        /// `with tf.control_dependencies()` blocks.These normally nest,
+        /// as described in the documentation for `control_dependencies()`.
+        /// 
+        /// The `control_inputs` argument list control dependencies that must be
+        /// added to the current set of control dependencies.Because of
+        /// uniquification the set can be empty even if the caller passed a list of
+        /// ops.The special value `None` indicates that we want to start a new
+        /// empty set of control dependencies instead of extending the current set.
+        /// 
+        /// In that case we also clear the current control flow context, which is an
+        /// additional mechanism to add control dependencies.
+        /// </summary>
+        /// <param name="graph">The graph that this controller is managing.</param>
+        /// <param name="control_inputs">List of ops to use as control inputs in addition
+        /// to the current control dependencies.None to indicate that
+        /// the dependencies should be cleared.
+        /// </param>
         public _ControlDependenciesController(Graph graph, List<ITensorOrOperation> control_inputs)
         {
             _graph = graph;
diff --git a/src/TensorFlowNET.Core/Operations/Operation.Input.cs b/src/TensorFlowNET.Core/Operations/Operation.Input.cs
index 5db34ce9..9ef89271 100644
--- a/src/TensorFlowNET.Core/Operations/Operation.Input.cs
+++ b/src/TensorFlowNET.Core/Operations/Operation.Input.cs
@@ -1,68 +1,79 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Runtime.InteropServices;
-using System.Text;
-
-namespace Tensorflow
-{
-    public partial class Operation
-    {
-        public TF_Output Input(int index) => c_api.TF_OperationInput(new TF_Input(_handle, index));
-        public TF_DataType InputType(int index) => c_api.TF_OperationInputType(new TF_Input(_handle, index));
-        public int InputListLength(string name) => c_api.TF_OperationInputListLength(_handle, name, status);
-        public int NumInputs => c_api.TF_OperationNumInputs(_handle);
-        private TF_DataType[] _input_types => _inputs._inputs.Select(x => x.dtype).ToArray();
-
-        private InputList _inputs;
-        public InputList inputs
-        {
-            get
-            {
-                if (_inputs == null)
-                {
-                    var retval = new Tensor[NumInputs];
-
-                    for (int i = 0; i < NumInputs; i++)
-                    {
-                        var tf_outpus = Input(i);
-                        var op = new Operation(tf_outpus.oper);
-                        retval[i] = op.outputs[tf_outpus.index];
-                    }
-
-                    _inputs = new InputList(retval);
-                }
-
-                return _inputs;
-            }
-        }
-
-        public int NumControlInputs => c_api.TF_OperationNumControlInputs(_handle);
-
-        public Operation[] control_inputs
-        {
-            get
-            {
-                return GetControlInputs();
-            }
-        }
-
-        public unsafe Operation[] GetControlInputs()
-        {
-            var control_inputs = new Operation[NumControlInputs];
-
-            if (NumControlInputs > 0)
-            {
-                IntPtr control_input_handle = Marshal.AllocHGlobal(Marshal.SizeOf<IntPtr>() * NumControlInputs);
-                c_api.TF_OperationGetControlInputs(_handle, control_input_handle, NumControlInputs);
-                for (int i = 0; i < NumControlInputs; i++)
-                {
-                    var handle = control_input_handle + Marshal.SizeOf<IntPtr>() * i;
-                    control_inputs[i] = new Operation(*(IntPtr*)handle);
-                }
-            }
-
-            return control_inputs;
-        }
-    }
-}
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace Tensorflow
+{
+
+    // from ops.py
+    public partial class Operation
+    {
+        public TF_Output Input(int index) => c_api.TF_OperationInput(new TF_Input(_handle, index));
+        public TF_DataType InputType(int index) => c_api.TF_OperationInputType(new TF_Input(_handle, index));
+        public int InputListLength(string name) => c_api.TF_OperationInputListLength(_handle, name, status);
+        public int NumInputs => c_api.TF_OperationNumInputs(_handle);
+        private TF_DataType[] _input_types => _inputs._inputs.Select(x => x.dtype).ToArray();
+
+        private InputList _inputs;
+        public InputList inputs
+        {
+            get
+            {
+                if (_inputs == null)
+                {
+                    var retval = new Tensor[NumInputs];
+
+                    for (int i = 0; i < NumInputs; i++)
+                    {
+                        var tf_outpus = Input(i);
+                        var op = new Operation(tf_outpus.oper);
+                        retval[i] = op.outputs[tf_outpus.index];
+                    }
+
+                    _inputs = new InputList(retval);
+                }
+
+                return _inputs;
+            }
+        }
+
+        public int NumControlInputs => c_api.TF_OperationNumControlInputs(_handle);
+
+        /// <summary>
+        /// The `Operation` objects on which this op has a control dependency.
+        /// 
+        /// Before this op is executed, TensorFlow will ensure that the
+        /// operations in `self.control_inputs` have finished executing.This
+        /// mechanism can be used to run ops sequentially for performance
+        /// reasons, or to ensure that the side effects of an op are observed
+        /// in the correct order.
+        /// </summary>
+        public Operation[] control_inputs
+        {
+            get
+            {
+                return GetControlInputs();
+            }
+        }
+
+        public unsafe Operation[] GetControlInputs()
+        {
+            var control_inputs = new Operation[NumControlInputs];
+
+            if (NumControlInputs > 0)
+            {
+                IntPtr control_input_handle = Marshal.AllocHGlobal(Marshal.SizeOf<IntPtr>() * NumControlInputs);
+                c_api.TF_OperationGetControlInputs(_handle, control_input_handle, NumControlInputs);
+                for (int i = 0; i < NumControlInputs; i++)
+                {
+                    var handle = control_input_handle + Marshal.SizeOf<IntPtr>() * i;
+                    control_inputs[i] = new Operation(*(IntPtr*)handle);
+                }
+            }
+
+            return control_inputs;
+        }
+    }
+}