2 files changed, 9 insertions, 3 deletions

diff --git a/readme.txt b/readme.txt
index 3892f01..6a4be58 100644
--- a/readme.txt
+++ b/readme.txt
@@ -18,9 +18,11 @@ cabal:
 
   cabal run
 
+
 todo
 ----
 
-* use Control.Monad.Except from mtl to handle errors
-* implement property based testing with quickcheck, look
-  under tests/Properties.hs
+* implement correct double/int interaction (src/Operators.hs)
+* implement boolean operations: and, not, or
+* write Ord instance for LispNumber (src/Operators.hs)
+* implement property based testing with quickcheck (tests/Properties.hs)
diff --git a/src/Operators.hs b/src/Operators.hs
index 9eaec38..fc0608e 100644
--- a/src/Operators.hs
+++ b/src/Operators.hs
@@ -19,6 +19,10 @@ data LispNumber = I Integer
                 | F Double
 
 instance Num LispNumber where
+    -- TODO:
+    -- float op anything = float
+    -- int op int = int
+    -- int op float = float
     (I a) + (I b) = I $ a + b
     (F a) + (F b) = F $ a + b
     (I a) - (I b) = I $ a - b