diff --git a/Scripts/Libs/CleaningPipeline/special_token.py b/Scripts/Libs/CleaningPipeline/special_token.py
index 3f25a2d..7e6349e 100644
--- a/Scripts/Libs/CleaningPipeline/special_token.py
+++ b/Scripts/Libs/CleaningPipeline/special_token.py
@@ -10,6 +10,7 @@ class SpecialToken(Enum):
     RELATIONSHIP = "<PRED>"
     OBJECT = "<OBJ>"
     ABSTRACT = "<ABS>"
+    END_OF_SENTENCE = "<EOS>"
     CORPUS_END = "<END>"
 
     ## Tasks' Token