Mention the stderr file in the documentation.

diff --git a/src/doc/build-script.md b/src/doc/build-script.md
index b747ed0c0953a1edd5552b41b480dbf9112d05ab..6de0ab9117fe403464e20c4f73e5c46fe1aeaee0 100644 (file)
--- a/src/doc/build-script.md
+++ b/src/doc/build-script.md
@@ -58,6 +58,9 @@ cargo:libdir=/path/to/foo/lib
 cargo:include=/path/to/foo/include
 ```
 
+On the other hand, lines printed to stderr are written to a file like
+`target/debug/build/<pkg>/stderr` but are not interpreted by cargo.
+
 There are a few special keys that Cargo recognizes, some affecting how the
 crate is built: