Updated guide.md with local config clarification

See also https://github.com/rust-lang/cargo/issues/1614

diff --git a/src/doc/guide.md b/src/doc/guide.md
index 853d1b57f73f7aad932f5fe5d14962feed8ac6a2..fca01ac726d971a668047ff8cb5e0457695f1066 100644 (file)
--- a/src/doc/guide.md
+++ b/src/doc/guide.md
@@ -375,6 +375,10 @@ This array should be filled with directories that contain a `Cargo.toml`. In
 this instance, we're just adding `conduit`, so it will be the only one that's
 overridden.
 
+Note: using a local configuration to override paths will only work for crates
+that have been published to crates.io.  You cannot use this feature to tell Cargo
+how to find local unpublished crates.
+
 More information about local configuration can be found in the [configuration
 documentation](config.html).