diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 9e75f36a..578da83f 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -170,9 +170,9 @@ Library reflects Bitcoin Core approach whenever possible.
 
 ### Formatting
 
-The repository currently does use `rustfmt`. The introduction of this is still
-WIP (see 'ignore' in `rustfmt.toml`) but we are working towards full
-formatting.
+The repository currently uses `rustfmt` (WIP, some directories are excluded). We use nightly
+features so to run the formatter use `cargo +nightly fmt`. (Remember that your editor may be
+configured to fmt with a stable toolchain, this will result in many unwanted changes.)
 
 ### Naming conventions