diff --git a/src/EscapeSequenceParser.ts b/src/EscapeSequenceParser.ts
index cd21977e..81042129 100644
--- a/src/EscapeSequenceParser.ts
+++ b/src/EscapeSequenceParser.ts
@@ -1,8 +1,3 @@
-/**
- * TODO:
- * - docs
- * - extend test cases
- */
 import { ParserState, ParserAction, IParsingState, IDcsHandler, IEscapeSequenceParser } from './Types';
 
 // number range macro
@@ -130,8 +125,8 @@ export const VT500_TRANSITION_TABLE = (function (): TransitionTable {
   table.add(0x3b, ParserState.CSI_PARAM, ParserAction.PARAM, ParserState.CSI_PARAM);
   table.addMany(r(0x40, 0x7f), ParserState.CSI_PARAM, ParserAction.CSI_DISPATCH, ParserState.GROUND);
   table.addMany([0x3a, 0x3c, 0x3d, 0x3e, 0x3f], ParserState.CSI_PARAM, ParserAction.IGNORE, ParserState.CSI_IGNORE);
-  table.addMany(r(0x20, 0x40), ParserState.CSI_IGNORE, null, ParserState.CSI_IGNORE);
-  table.add(0x7f, ParserState.CSI_IGNORE, null, ParserState.CSI_IGNORE);
+  table.addMany(r(0x20, 0x40), ParserState.CSI_IGNORE, ParserAction.IGNORE, ParserState.CSI_IGNORE);
+  table.add(0x7f, ParserState.CSI_IGNORE, ParserAction.IGNORE, ParserState.CSI_IGNORE);
   table.addMany(r(0x40, 0x7f), ParserState.CSI_IGNORE, ParserAction.IGNORE, ParserState.GROUND);
   table.add(0x3a, ParserState.CSI_ENTRY, ParserAction.IGNORE, ParserState.CSI_IGNORE);
   table.addMany(r(0x20, 0x30), ParserState.CSI_ENTRY, ParserAction.COLLECT, ParserState.CSI_INTERMEDIATE);