diff --git a/lib/lorentzian.f90 b/lib/lorentzian.f90
index cd2257a75..f3f4e14ef 100644
--- a/lib/lorentzian.f90
+++ b/lib/lorentzian.f90
@@ -1,7 +1,7 @@
 subroutine lorentzian(y,npts,a)
 
 ! Input:  y(npts); assume x(i)=i, i=1,npts
-! Output: a(5)
+! Output: a(1:5)
 !         a(1) = baseline
 !         a(2) = amplitude
 !         a(3) = x0