diff --git a/lib/ebnf/writer.rb b/lib/ebnf/writer.rb
index 2f8b229..f3b85e9 100644
--- a/lib/ebnf/writer.rb
+++ b/lib/ebnf/writer.rb
@@ -49,8 +49,8 @@ class Writer
       0x20 => 'space',
       0x22 => 'dquote',
       0x27 => 'apos',
-      0x2F => 'slash',
-      0x5C => 'back slash',
+      0x2F => 'solidus',
+      0x5C => 'reverse solidus',
       0x60 => 'grave',
       0x7F => 'delete',
       0x80 => 'padding character',