1 files changed, 2 insertions, 0 deletions

diff --git a/README.md b/README.md
index a2eaeae4..1d1f2fcb 100644
--- a/README.md
+++ b/README.md
@@ -454,6 +454,8 @@ if (DEBUG) {
 }
 ```
 
+You can specify nested constants in the form of `--define env.DEBUG=false`.
+
 UglifyJS will warn about the condition being always false and about dropping
 unreachable code; for now there is no option to turn off only this specific
 warning, you can pass `warnings=false` to turn off *all* warnings.