diff --git a/TODO b/TODO
index 3f3623af..67c5734e 100644
--- a/TODO
+++ b/TODO
@@ -1,9 +1,7 @@
-- does flatten work with float?
+- looks like flatten has some confusion with flatten->in and in
 
-  looks like it has some confusion with flatten->in and in
-
-  change rules for alphha max ... copy the premultiply convention of using
-  Type to set the range
+  change rules for flatten alpha max ... copy the premultiply thing of being
+  255 + a param, look at convert savveable
 
 
 
diff --git a/libvips/conversion/premultiply.c b/libvips/conversion/premultiply.c
index b668bd30..ad84e1e4 100644
--- a/libvips/conversion/premultiply.c
+++ b/libvips/conversion/premultiply.c
@@ -250,7 +250,7 @@ vips_premultiply_class_init( VipsPremultiplyClass *class )
 		G_STRUCT_OFFSET( VipsPremultiply, in ) );
 
 	VIPS_ARG_DOUBLE( class, "max_alpha", 115, 
-		_( "Maximum value" ), 
+		_( "Maximum alpha" ), 
 		_( "Maximum value of alpha channel" ),
 		VIPS_ARGUMENT_OPTIONAL_INPUT,
 		G_STRUCT_OFFSET( VipsPremultiply, max_alpha ),
diff --git a/libvips/conversion/unpremultiply.c b/libvips/conversion/unpremultiply.c
index b26591c7..a806f0e7 100644
--- a/libvips/conversion/unpremultiply.c
+++ b/libvips/conversion/unpremultiply.c
@@ -261,7 +261,7 @@ vips_unpremultiply_class_init( VipsUnpremultiplyClass *class )
 		G_STRUCT_OFFSET( VipsUnpremultiply, in ) );
 
 	VIPS_ARG_DOUBLE( class, "max_alpha", 115, 
-		_( "Maximum value" ), 
+		_( "Maximum alpha" ), 
 		_( "Maximum value of alpha channel" ),
 		VIPS_ARGUMENT_OPTIONAL_INPUT,
 		G_STRUCT_OFFSET( VipsUnpremultiply, max_alpha ),