Specify which categories are enabled by default

Closes #3293

diff --git a/README.md b/README.md
index 14a5e56cdea5ce2256ea4351da077d257dd77036..cf3b3e1ffddf5a8d4922e886d1ce7e889dcf7cc1 100644 (file)
--- a/README.md
+++ b/README.md
@@ -24,6 +24,15 @@ We have a bunch of lint categories to allow you to choose how much Clippy is sup
 
 More to come, please [file an issue](https://github.com/rust-lang-nursery/rust-clippy/issues) if you have ideas!
 
+Only the following of those categories are enabled by default:
+
+* `clippy::style`
+* `clippy::correctness`
+* `clippy::complexity`
+* `clippy::perf`
+
+Other categories need to be enabled in order for their lints to be executed.
+
 Table of contents:
 
 *   [Usage instructions](#usage)