diff --git a/Paper/Open-Vocabulary Semantic Segmentation.md b/Paper/Open-Vocabulary Semantic Segmentation.md
index 729e356..0d9443d 100644
--- a/Paper/Open-Vocabulary Semantic Segmentation.md	
+++ b/Paper/Open-Vocabulary Semantic Segmentation.md	
@@ -1,4 +1,8 @@
 ## Introduction
+- Two-stage approach
+	1. Generate class-agnostic mask proposal
+	2. 
+
 
 ## 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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