Update README.md

README.md

@@ -8,6 +8,8 @@ AxBench evaluates interpretability methods in terms of concept detection and mod
 
 # 2. What is `gemma-diffmean-9b-it-res`?
 
+It is a single dictionary of subspaces for 16K concepts and serves as a drop-in replacement for SAEs.
+
 - `gemma-`: Refer to Gemma 2 models
 - `diffmean-` : The dictionary learning model is taking the difference in mean between two contrastive groups.
 - `9b-it-`: The dictionary is for Gemma 2 9B instruction-tuning model