add imatrix origin

README.md

@@ -23,7 +23,7 @@ An example of a complex debugging scenario is where you build library A on top o
 
 ![](./model_v0.1_throughput_comparison.png)
 
-IQ here refers to Importance Matrix Quantization. For performance comparison against regular GGUF, please read [this Reddit post](https://www.reddit.com/r/LocalLLaMA/comments/1993iro/ggufs_quants_can_punch_above_their_weights_now/).
+IQ here refers to Importance Matrix Quantization. For performance comparison against regular GGUF, please read [this Reddit post](https://www.reddit.com/r/LocalLLaMA/comments/1993iro/ggufs_quants_can_punch_above_their_weights_now/). For more info on the techique, please see [this GitHub discussion](https://github.com/ggerganov/llama.cpp/discussions/5006/).
 
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