Add doc comment to module

diff --git a/crates/ra_cargo_watch/src/conv/test.rs b/crates/ra_cargo_watch/src/conv/test.rs
index 69a07be11c237d743a8e7bf3304a7ec13c47f07a..6817245c2bde518855f9cc726dd42c927eb8470b 100644 (file)
--- a/crates/ra_cargo_watch/src/conv/test.rs
+++ b/crates/ra_cargo_watch/src/conv/test.rs
@@ -1,3 +1,5 @@
+//! This module contains the large and verbose snapshot tests for the
+//! conversions between `cargo check` json and LSP diagnostics.
 use crate::*;
 
 fn parse_diagnostic(val: &str) -> cargo_metadata::diagnostic::Diagnostic {