diff --git a/Paper/Open-Vocabulary Semantic Segmentation.md b/Paper/Open-Vocabulary Semantic Segmentation.md
index f771eeb..729e356 100644
--- a/Paper/Open-Vocabulary Semantic Segmentation.md	
+++ b/Paper/Open-Vocabulary Semantic Segmentation.md	
@@ -1,4 +1,4 @@
+## Introduction
 
-
-### Vocabularies
+## Vocabularies
 1. ground-truth masks: refer to the manually annotated masks or pixel-level labels that are used to define the correct segmentation of objects in an image. Each pixel in the ground-truth mask is assigned a specific class label corresponding to the object or region it belongs to.
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