diff --git a/prefsize_windows.go b/prefsize_windows.go
index 5e761ec..cb44f2c 100644
--- a/prefsize_windows.go
+++ b/prefsize_windows.go
@@ -42,6 +42,10 @@ var stdDlgSizes = [nctypes]dlgunits{
 		height:	10,
 	},
 	c_combobox:	dlgunits{
+		// technically the height of a combobox has to include the drop-down list (this is a historical accident: originally comboboxes weren't drop-down)
+		// but since we're forcing Common Controls version 6, we can take advantage of one of its mechanisms to automatically fix this mistake (bad practice but whatever)
+		// see also: http://blogs.msdn.com/b/oldnewthing/archive/2006/03/10/548537.aspx
+		// note that the Microsoft guidelines pages don't take the list size into account
 		longest:	true,
 		height:	12,		// from the Visual Studio 2012 offline docs's Win32 layout page; the online page above says 14
 	},
diff --git a/todo.md b/todo.md
index ae9f48a..b59dbc9 100644
--- a/todo.md
+++ b/todo.md
@@ -14,8 +14,6 @@ important things:
 - LineEdit heights on Windows seem too big; either that or LineEdit, Button, and Label text is not vertically centered properly
 	- are Checkboxes and Comboboxes too small?
 	- Cocoa has similar margining issues (like Comboboxes having margins)
-- sometimes the size of the drop-down part of a Combobox becomes 0 or 1 or some other impossibly small value on Windows
-	- http://blogs.msdn.com/b/oldnewthing/archive/2006/03/10/548537.aspx
 - make gcc (Unix)/clang (Mac OS X) pedantic about warnings/errors; also -Werror
 	- problem: cgo-generated files trip -Werror up; I can't seem to turn off unused argument warnings with the -Wall/-Wextra/-pedantic options
 - make sure scrollbars in Listbox work identically on all platforms (specifically the existence and autohiding of both horizontal and vertical scrollbars)