diff --git a/README-CS521.md b/README-CS521.md
index 345d4a02d0f496f29543379d10f3726ab622742c..1e5da738f1f5107248ef86741544bf69c18aec40 100644
--- a/README-CS521.md
+++ b/README-CS521.md
@@ -3,6 +3,11 @@ To benchmark matrix multiply with CUDA, run:
 cargo bench -p juno_matmul --features=cuda
 ```
 
+To see what code is specific to the CS 521 project, run:
+```
+git diff main matmul_gpu_opt
+```
+
 Times for (512, 512) X (512, 512) (ms):
 Base: 65.554
 Larger blocks: 4.887