Update README.md

README.md

@@ -75,7 +75,11 @@ For Yamnet-1024
 # Performances
 
 ## Metrics
-Measures are done with default STEDGEAI configuration with enabled input / output allocated option.
+
+* Measures are done with default STEDGEAI configuration with enabled input / output allocated option.
+
+* `tl` stands for "transfer learning", meaning that the model backbone weights were initialized from a pre-trained model, then only the last layer was unfrozen during the training.
+
 
 ### Reference **NPU** memory footprint based on ESC-10 dataset
 |Model      | Dataset       | Format   | Resolution | Series    | Internal RAM (KiB) | External RAM (KiB) | Weights Flash (KiB) | STM32Cube.AI version | STEdgeAI Core version |