diff --git a/sherpa-ncnn/csrc/alsa.cc b/sherpa-ncnn/csrc/alsa.cc
index dac9fd17..45d2f02b 100644
--- a/sherpa-ncnn/csrc/alsa.cc
+++ b/sherpa-ncnn/csrc/alsa.cc
@@ -62,7 +62,7 @@ card 3: UACDemoV10 [UACDemoV1.0], device 0: USB Audio [USB Audio]
 
 and if you want to select card 3 and the device 0 on that card, please use:
 
-  hw:3,0
+  plughw:3,0
 
   )";
 
diff --git a/sherpa-ncnn/csrc/sherpa-ncnn-alsa.cc b/sherpa-ncnn/csrc/sherpa-ncnn-alsa.cc
index fd29f684..77908b0d 100644
--- a/sherpa-ncnn/csrc/sherpa-ncnn-alsa.cc
+++ b/sherpa-ncnn/csrc/sherpa-ncnn-alsa.cc
@@ -67,7 +67,7 @@ card 3: UACDemoV10 [UACDemoV1.0], device 0: USB Audio [USB Audio]
 
 and if you want to select card 3 and the device 0 on that card, please use:
 
-  hw:3,0
+  plughw:3,0
 
 as the device_name.
 )usage";