base64: add docstring

diff --git a/src/libstd/base64.rs b/src/libstd/base64.rs
index cdc15ae1d45dcec5bb4cd7b8528464486c29ef09..d3452712728b96d174d9d989534317bfc12aed91 100644 (file)
--- a/src/libstd/base64.rs
+++ b/src/libstd/base64.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+//! Base64 binary-to-text encoding
+
 use core::iter;
 use core::str;
 use core::vec;