diff --git a/VRAHaulmkilling-API.md b/VRAHaulmkilling-API.md
index a1fd3e3..9b6a492 100644
--- a/VRAHaulmkilling-API.md
+++ b/VRAHaulmkilling-API.md
@@ -243,7 +243,22 @@ Response 403 No WRITE permissions in item
 Response 404 Item not found  
 
 ##### Optional input parameters #####
-There are some optional input parameters for greater flexibility.
+There are some optional task attribute input parameters for greater flexibility.
+
+* **inputLayerName**  
+Allows you to specify which layer to use for an input item.
+* **minPercentile** value between 0.0 - 1.0  
+Allows you to specify the minimum percentile value to 'filter' lower bound input data
+* **maxPercentile** value between 0.0 - 1.0  
+Allows you to specify the maximum percentile value to 'filter' upperbound bound input data
+* **plantingDate** if relevant  
+Allows you to specify the date the crop is planted.
+* **measurementDate** if relevant  
+allows you to specify the date when the measurements were taken.
+
+Default input layer name for Haulmkilling is the agent inputType used (wdvi, ndvi).  
+Default percentile values for Haulmkilling are 0.05 and 0.90.  
+Default dates are 'inherited' from the cropfield item passed to the task.
 
 ##### Create taskmap
 [Create Taskmap](Create-Taskmap.md)