diff --git a/src/Engine/Operator/GeometryOpDef.h b/src/Engine/Operator/GeometryOpDef.h
index 635be41..12f44c2 100644
--- a/src/Engine/Operator/GeometryOpDef.h
+++ b/src/Engine/Operator/GeometryOpDef.h
@@ -13,17 +13,58 @@ namespace enzo::nt
 {
 class NetworkManager;
 
+/**
+* @brief Abstract class used to create new operators.
+*
+* The operator definition is a base class from which new geometry operators
+* are inherited from. It provides and abstracted interface, to read and
+* write data about itself and the context it is being computed.
+*
+* The class exposes utility functions for setting outputs and reading information
+* about itself like the number of inputs.
+* 
+* The most important part of this node is the virtual cookOp member function.
+* This must be overridden to implement the node's logic when being cooked.
+* When a node is cooked it takes the optional input geometry from the context
+* class and outputs new geometry based on the purpose of that operator.
+*/
 class BOOST_SYMBOL_EXPORT GeometryOpDef
 {
 public:
+    /**
+    * @brief Sets up internal state
+    */
     GeometryOpDef(nt::NetworkManager* network, op::OpInfo opInfo);
+    /**
+    * @brief This function is called at runtime to create the output geometry
+    *
+    * @post When overriding, this function must call setOutputGeo(n) at
+    * the end of a successful cook. Any outputs that are not set will output
+    * an emtpy geometry object.
+    */
     virtual void cookOp(op::Context context) = 0;
+
+    /**
+     * @brief Returns the current output geometry.
+     *
+     * For use by the runtime Node
+     * Does not force a cook.
+     *
+     * @todo move to friend class Node
+     */
     geo::Geometry& getOutputGeo(unsigned outputIndex);
 
+    /**
+    * @brief Stops the cook and displays an error. Use inside the #cookOp function.
+    * @todo Add visual error to GUI
+    */
     void throwError(std::string error);
 
+    /// @brief Returns the minimum number of input connections for the node to function required. Set by op::OpInfo when registering the operator.
     unsigned int getMinInputs() const;
+    /// @brief Returns the maximum number of input connections accepted by the node. Set by op::OpInfo when registering the operator.
     unsigned int getMaxInputs() const;
+    /// @brief Returns the number of available outputs the node provides. Set by op::OpInfo when registering the operator.
     unsigned int getMaxOutputs() const;
 private:
     std::vector<enzo::geo::Geometry> outputGeometry_;