diff --git a/ho_basis.jl b/ho_basis.jl
index eacedfe..e1cc7ed 100644
--- a/ho_basis.jl
+++ b/ho_basis.jl
@@ -8,7 +8,7 @@ function get_sp_basis(E_max)
     ns = Int[]
     ls = Int[]
 
-    # Heyde p67 with E = N and n = k + 1
+    # E = 2*n + l
     for E in 0 : E_max
         for n in 0 : E ÷ 2
             l = E - 2*n