diff --git a/paper_data/check_positivity.jl b/paper_data/check_positivity.jl
index b1bbc88..8c834a1 100644
--- a/paper_data/check_positivity.jl
+++ b/paper_data/check_positivity.jl
@@ -10,7 +10,7 @@ using JLD
 include("sqadjop.jl")
 
 invalid_use_message = """You need to call this script in the parent folder of oSAutF5_r2 folder.
-Provide also the two parameters: `-k` and `-lambda`"""
+Provide also the two (numerical) parameters: `-k` and `-lambda`"""
 
 if !(iseven(length(ARGS)))
     throw(invalid_use_message)