Update README.md

README.md

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 UniCorrn is the first correspondence model with shared weights that unifies 2D-2D, 2D-3D, and 3D-3D geometric matching with an end-to-end transformer architecture.
 
-This model space contains the large-scale pretrained weights from stage1 and stage2 training.
+This model space contains the large-scale pretrained weights from Stage 1 and Stage 2 training, as well as a modified version of the CroCoV2 weights adapted to match our model attributes.
 
 ## Quick Start