diff --git a/Cargo.toml b/Cargo.toml
index 39a8520..a644af2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,13 +21,9 @@
 unicode-xid = "0.1"
 
 [features]
-
 # When enabled: act as a shim around the nightly compiler's proc_macro crate.
 # This requires a nightly compiler.
 #
 # When disabled: emulate the same API as the nightly compiler's proc_macro crate
 # but in a way that works on all stable compilers >=1.15.0.
 nightly = []
-
-# Deprecated; use "nightly" instead.
-unstable = ["nightly"]