diff --git a/src/OneScript.Language/LexicalAnalysis/LabelLexerState.cs b/src/OneScript.Language/LexicalAnalysis/LabelLexerState.cs
index d9734fb91..fbabf2d8c 100644
--- a/src/OneScript.Language/LexicalAnalysis/LabelLexerState.cs
+++ b/src/OneScript.Language/LexicalAnalysis/LabelLexerState.cs
@@ -1,3 +1,10 @@
+/*----------------------------------------------------------
+This Source Code Form is subject to the terms of the
+Mozilla Public License, v.2.0. If a copy of the MPL
+was not distributed with this file, You can obtain one
+at http://mozilla.org/MPL/2.0/.
+----------------------------------------------------------*/
+
 using System.Diagnostics;
 using OneScript.Localization;
 
diff --git a/src/OneScript.Language/SyntaxAnalysis/AstNodes/ErrorTerminalNode.cs b/src/OneScript.Language/SyntaxAnalysis/AstNodes/ErrorTerminalNode.cs
index b3a0a3deb..a4a3c76f9 100644
--- a/src/OneScript.Language/SyntaxAnalysis/AstNodes/ErrorTerminalNode.cs
+++ b/src/OneScript.Language/SyntaxAnalysis/AstNodes/ErrorTerminalNode.cs
@@ -1,3 +1,10 @@
+/*----------------------------------------------------------
+This Source Code Form is subject to the terms of the
+Mozilla Public License, v.2.0. If a copy of the MPL
+was not distributed with this file, You can obtain one
+at http://mozilla.org/MPL/2.0/.
+----------------------------------------------------------*/
+
 using OneScript.Language.LexicalAnalysis;
 
 namespace OneScript.Language.SyntaxAnalysis.AstNodes
diff --git a/src/OneScript.Language/SyntaxAnalysis/AstNodes/LabelNode.cs b/src/OneScript.Language/SyntaxAnalysis/AstNodes/LabelNode.cs
index f26c8adc5..9721e90ce 100644
--- a/src/OneScript.Language/SyntaxAnalysis/AstNodes/LabelNode.cs
+++ b/src/OneScript.Language/SyntaxAnalysis/AstNodes/LabelNode.cs
@@ -1,3 +1,10 @@
+/*----------------------------------------------------------
+This Source Code Form is subject to the terms of the
+Mozilla Public License, v.2.0. If a copy of the MPL
+was not distributed with this file, You can obtain one
+at http://mozilla.org/MPL/2.0/.
+----------------------------------------------------------*/
+
 using OneScript.Language.LexicalAnalysis;
 
 namespace OneScript.Language.SyntaxAnalysis.AstNodes