Explain use of debug\! in tutorial

rust-lang · Apr 17, 2013 · 7373c64 · 7373c64 · bors · Apr 18, 2013
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diff --git a/doc/tutorial.md b/doc/tutorial.md
@@ -1669,6 +1669,9 @@ do spawn {
 }
 ~~~~
 
+If you want to see the output of `debug!` statements, you will need to turn on `debug!` logging.
+To enable `debug!` logging, set the RUST_LOG environment variable to `debug` (e.g., with bash, `export RUST_LOG=debug`)
+
 ## For loops
 
 The most common way to express iteration in Rust is with a `for`