fmt.rs: add note about lack of padding support for some types

diff --git a/src/libcollections/fmt.rs b/src/libcollections/fmt.rs
index 80fa6d397c82911852f24658c2ae572cbc80cb6f..cb023bcb7a586b3e7be08f26f12007ace67050bd 100644 (file)
--- a/src/libcollections/fmt.rs
+++ b/src/libcollections/fmt.rs
@@ -353,6 +353,10 @@
 //! * `^` - the argument is center-aligned in `width` columns
 //! * `>` - the argument is right-aligned in `width` columns
 //!
+//! Note that alignment may not be implemented by some types. A good way
+//! to ensure padding is applied is to format your input, then use this
+//! resulting string to pad your output.
+//!
 //! ## Sign/#/0
 //!
 //! These can all be interpreted as flags for a particular formatter.