diff --git a/README.md b/README.md
index 32684bd..dd57725 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,7 @@ be ground. The polynomial resulting from the sum is in simplified form.
 third one. The two first arguments are assumed to be ground.
 The polynomial resulting from the sum is in simplified form.
 
-> Note: `foo/N` means the funciton `foo` has `N` parameters.
+> Note: `foo/N` means the funciton `foo` has `N` parameters (this is known as arity).
   These names are the ones requested in the assignment.
 
 ## Tests