diff --git a/avaframe/com4FlowPy/com4FlowPyCfg.ini b/avaframe/com4FlowPy/com4FlowPyCfg.ini
index f5be66d51..c4920e7d8 100644
--- a/avaframe/com4FlowPy/com4FlowPyCfg.ini
+++ b/avaframe/com4FlowPy/com4FlowPyCfg.ini
@@ -140,9 +140,14 @@ minDetrainmentFor = 0
 velThForDetrain   = 0
 
 #++++++++++++ ForestFrictionLayer
-# maxDetrainmentFor [°]: default set to '0' (i.e. no detrainment) - foreste_detrainment val:
-# minDetrainmentFor [°]: default set to '0' (i.e. no detrainment) - foreste_detrainment val:
-# velThForDetrain [m/s]: velocity threshold for forest-detraiment effect # default set to '0' (i.e. no detrainment) - foreste_detrainment val:
+# The forest layer defines the alpha angle in forested areas.
+# If forestFrictionLayerType = relative, forest layer values are added to the global alpha angle.
+# e.g. if alpha = 24° and value on forest cell is 5°, then effective  local alpha of 24° + 5° = 29° will be used.
+# -------------------
+# If forestFrictionLayerType = absolute, forest layer values are used as alpha angle,
+# if they are larger than the global alpha angle.
+# e.g. if global alpha = 24° and value provided in the forestFrictionLayer on a cell is 35°,
+# then local alpha of 35° will be used.
 #++++++++++++
 
 # ['absolute', 'relative']