diff --git a/README b/README
index 7540ed8..e577e2d 100644
--- a/README
+++ b/README
@@ -25,9 +25,9 @@ endianness = ("little endian" | "big endian") '\n'.
 definition = [ IDENT ] ':' type '\n'.
 
 type = bytefield
-  | int8    | int16  | int32  | int64
-  | uint8   | uint16 | uint32 | uint64
-  | float32 | float64
+  | "int8"    | "int16"  | "int32"  | "int64"
+  | "uint8"   | "uint16" | "uint32" | "uint64"
+  | "float32" | "float64"
 .
 
 bytefield = "byte[" ( INTEGER | IDENT ) "]".