diff --git a/src/doc/manifest.md b/src/doc/manifest.md
index bf2cf4d2354..e45311415ed 100644
--- a/src/doc/manifest.md
+++ b/src/doc/manifest.md
@@ -734,7 +734,7 @@ source's original crate is replaced.
 More information about overriding dependencies can be found in the [overriding
 dependencies][replace] section of the documentation and [RFC 1969] for the
 technical specification of this feature. Note that the `[patch]` feature will
-first become available in Rust 1.20, set to be released on 2017-08-31.
+first become available in Rust 1.21, set to be released on 2017-10-12.
 
 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
 [replace]: specifying-dependencies.html#overriding-dependencies