diff --git a/notes b/notes
index d18f66e..36f6460 100644
--- a/notes
+++ b/notes
@@ -27,7 +27,13 @@ H[:]
 end 
 
 
+For SED
+─────────────
+At low end transition to slope of 2
 
+at high end cutoff to slope -2.5
+
+check out Kirk's slope explanation for better approximations