Clarify debug mode vs release mode building in the readme

Author: bjorn3

Readme.md

@@ -21,7 +21,7 @@ $ ./test.sh --release
 $ CHANNEL="release" $cg_clif_dir/cargo.sh run
 ```
 
-If you compiled cg_clif in debug mode you should use `CHANNEL="debug"` instead or omit `CHANNEL="release"` completely.
+If you compiled cg_clif in debug mode (aka you didn't pass `--release` to `./test.sh`) you should use `CHANNEL="debug"` instead or omit `CHANNEL="release"` completely.
 
 ### Rustc