diff --git a/README.md b/README.md
index 87be038..a3c4947 100644
--- a/README.md
+++ b/README.md
@@ -64,8 +64,8 @@ Optional arguments:
 	--percentage INT	Threshold in percent (Default: 0)
 	
 	Filter unknown motifs:
-	--min_size_fp INT	(Default: 10)
-	--max_size_fp INT	(Default: 100)
+	--min_size_fp INT	Minimum sequence length threshold. Smaller sequences are discarded. (Default: 10)
+	--max_size_fp INT	Maximum sequence length threshold. Discards all sequences longer than this value. (Default: 100)
 	
 	Clustering:
 	Sequence preparation/ reduction: