Update Configuration Documentation

docs/configuration.md

@@ -14,7 +14,7 @@ There are three config files:
 
 ### Prefilling of ISA entities during wizard initialization
 
-`config.prefill` is an array of objects. Each object consists of the keys `isasMapping` and `values`
+`config.prefill` is an array of objects. Each object consists of the keys `isaMapping` and `values`
 
 Example to prefill the initially empty ISA object with a person under investigation level:
 
@@ -37,9 +37,47 @@ window.config = {
                 affiliation : 'IPK Gatersleben'
             }
         }
-    ],
+    ]
+}    
 ```
 
+Example to prefill a comment in the ISA object under investigation (alternatively study/assay) level:
+
+```javascript
+window.config = {
+    prefill: [
+        {
+            type: 'comment',
+            isaMapping: {
+                entity: 'investigation',
+                attribute: 'comments'
+            },
+            values: {
+                name: 'Study Country',
+                value: 'Germany'
+            }
+        }
+    ]
+} 
+```
+
+Example to prefill any ISA attribute, here the 'Study Description' in the ISA object under study (alternatively investigation/assay) level:
+
+```javascript
+window.config = {
+    prefill: [
+        {
+            type: 'value',
+            isaMapping: {
+                entity: 'study',
+                attribute: 'description',
+                studyIndex: 0
+            },
+            value: 'Prefilled study description ...'
+        }
+    ]
+}
+```
 
 ## wizard.steps.config.js