diff --git a/README.md b/README.md
index 8d9789c..b0ee48f 100644
--- a/README.md
+++ b/README.md
@@ -4,9 +4,9 @@ DeepXTrace is a lightweight diagnostic tool designed to efficiently and precisel
 
 DeepXTrace supports diagnosis of various slowdown scenarios, including:
 
-* *Comp-Slow*: Slowdown caused by the destination rank (e.g., xPU compute latency).
-* *Mixed-Slow*: Slowdown caused by the source rank(e.g., uneven expert distribution or hotspot congestion).
-* *Comm-Slow*: Slowdown caused by the communication path between specific source and destination ranks(e.g., communication link issues).
+* *Comp-Slow*: Slowdown caused by sender-side issues, such as uneven computation (e.g., Attention/MoE) that delays `send` communication operators.
+* *Mixed-Slow*: Slowdown caused by receiver-side issues, such as uneven computation (e.g., Attention/MoE) that triggers early `recv` communication operators on GPUs, or hotspot experts that cause network Incast.
+* *Comm-Slow*: Slowdown caused by the communication path between the sender and receiver (e.g., communication link issues).
 
 
 ![slow](figures/slow.png)
@@ -21,6 +21,8 @@ The following figure shows the latency matrix for the Combine operator's token r
 
 ![combine](figures/combine.png)
 
+For performance analysis, use the **[DeepXTrace Heatmap Visualization Tool](tools/README.md)** to visualize communication bottlenecks.
+
 ##  MoE-COMM-Metrics-Probe
 
 A low-overhead module for measuring critical diagnostic indicators during MoE communication. Supported Implementations: