diff --git a/codec2talkie/src/main/res/values/strings.xml b/codec2talkie/src/main/res/values/strings.xml
index 9f179b2..5d2fb1d 100644
--- a/codec2talkie/src/main/res/values/strings.xml
+++ b/codec2talkie/src/main/res/values/strings.xml
@@ -194,7 +194,7 @@
 
     <string name="aprs_category_title">AX.25/APRS settings</string>
     <string name="aprs_voax25_enable_title">Enable voice over AX.25</string>
-    <string name="aprs_voax25_enable_summary">Send voice packets inside AX.25 frames</string>
+    <string name="aprs_voax25_enable_summary">Send voice packets inside AX.25 UI frames with PID 0x1f</string>
     <string name="aprs_enable_title">Enable APRS</string>
     <string name="aprs_enable_summary">Enable APRS tracker</string>
     <string name="aprs_callsign_title">Callsign (without SSID)</string>