diff --git a/src/Scales.hs b/src/Scales.hs
index d6763e6..0fda65e 100644
--- a/src/Scales.hs
+++ b/src/Scales.hs
@@ -8,6 +8,8 @@ module Scales (
   cScale,
   ciScale,
   dScale,
+  aScale,
+  bScale,
   kScale,
   t1Scale,
   t2Scale,
@@ -15,6 +17,8 @@ module Scales (
   ll2Scale,
   ll3Scale,
   lScale,
+
+  π, ρ, ρ', ρ''
 ) where
 
 import SlideRule