diff --git a/docs/en/t3_s3_sx1276/t3_s3_sx1276_hw.md b/docs/en/t3_s3_sx1276/t3_s3_sx1276_hw.md
index c1a105c..0be4b67 100644
--- a/docs/en/t3_s3_sx1276/t3_s3_sx1276_hw.md
+++ b/docs/en/t3_s3_sx1276/t3_s3_sx1276_hw.md
@@ -164,6 +164,12 @@
 | Transfer rate(FSK)  | 1.2K～300Kbps                   |
 | Modulation          | FSK, GFSK, MSK, GMSK, LoRa，OOK |
 
+> [!IMPORTANT]
+> When the bandwidth is lower than 62.5kHz, LoRa modules using non-TCXOs will not be able to communicate fully.
+> This will result in poor communication quality.
+> If you need to use a bandwidth lower than 62.5kHz, please use a [TCXO Version](https://lilygo.cc/products/t3-s3-v1-3?variant=45367157883061)
+>
+
 ## WiFi-IPEX
 
 * The following figure shows how to switch the onboard WIFI antenna to IPEX
diff --git a/docs/en/t3_tcxo_sx1276/t3_tcxo_sx1276_hw.md b/docs/en/t3_tcxo_sx1276/t3_tcxo_sx1276_hw.md
index 725f393..287f2ea 100644
--- a/docs/en/t3_tcxo_sx1276/t3_tcxo_sx1276_hw.md
+++ b/docs/en/t3_tcxo_sx1276/t3_tcxo_sx1276_hw.md
@@ -148,6 +148,11 @@
 | Transfer rate(FSK)  | 1.2K～300Kbps                   |
 | Modulation          | FSK, GFSK, MSK, GMSK, LoRa，OOK |
 
+> [!IMPORTANT]
+> When the bandwidth is lower than 62.5kHz, LoRa modules using non-TCXOs will not be able to fully communicate, resulting in poor communication quality.
+> Modules equipped with TCXOs do not experience this issue.
+>
+
 #### Resource
 
 * [T3-TCXO schematic](../../../schematic/T3_V3.0.pdf)