diff --git a/CHANGES b/CHANGES
--- a/CHANGES
+++ b/CHANGES
@@ -124,3 +124,6 @@
 
 0.2.6:
 		added BDF(..) export and loadBDFRaw to EEG.BDF
+
+0.2.6.1:
+		added warning about data conversion to loadBDFRaw
diff --git a/hsignal.cabal b/hsignal.cabal
--- a/hsignal.cabal
+++ b/hsignal.cabal
@@ -1,5 +1,5 @@
 Name:               hsignal
-Version:            0.2.6
+Version:            0.2.6.1
 License:            BSD3
 License-file:       LICENSE
 Copyright:          (c) A.V.H. McPhail 2010, 2011, 2014
diff --git a/lib/Numeric/Signal/EEG/BDF.hs b/lib/Numeric/Signal/EEG/BDF.hs
--- a/lib/Numeric/Signal/EEG/BDF.hs
+++ b/lib/Numeric/Signal/EEG/BDF.hs
@@ -108,6 +108,7 @@
 data Time = Time { hour :: Int, minute :: Int, second :: Int }
           deriving(Eq,Ord,Show)
 
+-- | BDF datatype.  NOTE: data has already been converted to Float
 data BDF = BDF {
                 id_ :: !Word8
                 , type_ :: !String
@@ -289,6 +290,7 @@
              return m
 
 -- | Load a BDF data structure
+--   NOTE: data has already been converted to Float
 loadBDFRaw :: FilePath -> IO (Maybe BDF)
 loadBDFRaw fn = do
   bs <- BS.readFile fn