diff --git a/src/main/java/net/finmath/util/config/ConfigTree.java b/src/main/java/net/finmath/util/config/ConfigTree.java
index 516322dc1a..6a8a9c1da4 100644
--- a/src/main/java/net/finmath/util/config/ConfigTree.java
+++ b/src/main/java/net/finmath/util/config/ConfigTree.java
@@ -14,11 +14,71 @@
/**
* Config Tree: A tree based representation of configurations that can be selected with a key-value map describing the selector.
*
+ * Selector ↦ Configuration
+ *
+ *
+ * - configuration
+ * -
* A configuration is a value (Object) assigned to a selector (Map<String, Object>).
+ *
+ *
+ * - selector
+ * -
* A selector is a key-value map where certain properties (String) have certain values (Object).
* Properties of the selector are checked in a fixed order,
* such that a tree is formed, where each property corresponds to a level (depth) in the tree.
- * Each level has a special branch for DEFAULT VALUES, if the selector value does not match any value of other nodes.
+ *
+ *
+ * - default values
+ * -
+ * Each level has a special branch for DEFAULT VALUES, if the given selector value does not match any value of other nodes.
+ *
+ *
+ *
+ * Selector Key Order
+ *
+ * The selector is matched against the configurtion list by checking the keys in a certain order. This oder does not matter if there is a unique value
+ * for the given selector, but it may matter if default values have to be assign. See the following example.
+ *
+ * Example
+ *
+ * The configuration is determied by the value of two properties ("prop1" and "prop2") (the keys). The correspondig configuration value is
+ *
+ *
+
+ *
+ * | prop1 | prop2 | value |
|---|
+ * | A | 1 | 42.0 |
+ * | A | 2 | 3141 |
+ * | B | 1 | 1 |
+ * | B | 2 | 2 |
+ * | A | DEFAULT_VALUE | 12 |
+ * | DEFAULT_VALUE | 2 | 13 |
+ * | DEFAULT_VALUE | DEFAULT_VALUE | 66 |
+ * The list of maps that defines all configurations.
+ *
+ *
+ *
+ *
+ * Initialising the class with this configuration we have:
+ *
+ * -
+ * If the class is initialized with keyOder = { "prop1" , "prop2" }
+ *
+ * - The selector { "prop1" = "A", "prop2" = 2 } results in the value 3141.
+ * - The selector { "prop1" = "C", "prop2" = 2 } results in the value 13 (the default branch for prop1 is selected first, under that branch value 2 for "prop2" exists).
+ * - The selector { "prop1" = "C", "prop2" = 1 } results in the value 66 (the default branch for prop1 is selected first, under that branch no value 1 for "prop2" exists).
+ *
+ *
+ * -
+ * If the class is initialized with keyOder = { "prop2" , "prop1" }
+ *
+ * - The selector { "prop1" = "A", "prop2" = 2 } results in the value 3141.
+ * - The selector { "prop1" = "C", "prop2" = 2 } results in the value 13 (the branch "2" for prop2 is selected first, under that branch no value C for "prop1" exists).
+ * - The selector { "prop1" = "C", "prop2" = 1 } results in an exception that no configuration is found (the branch 1 for prop2 is selected first, under that branch no value C for "prop1" exists).
+ *
+ *
+ *
*
* @author Christian Fries
*/