diff --git a/xwords4/android/app/src/main/java/org/eehouse/android/xw4/BTInviteDelegate.java b/xwords4/android/app/src/main/java/org/eehouse/android/xw4/BTInviteDelegate.java
index 4885ec0c9..93379b656 100644
--- a/xwords4/android/app/src/main/java/org/eehouse/android/xw4/BTInviteDelegate.java
+++ b/xwords4/android/app/src/main/java/org/eehouse/android/xw4/BTInviteDelegate.java
@@ -152,6 +152,10 @@ public class BTInviteDelegate extends InviteDelegate {
         m_pairs = null;
         if ( 0 < btNames.length ) {
             m_pairs = TwoStringPair.make( btNames, btAddrs );
+        } else {
+            makeNotAgainBuilder( R.string.not_again_emptybtscan,
+                                 R.string.key_notagain_emptybtscan )
+                .show();
         }
 
         updateListAdapter( m_pairs );
diff --git a/xwords4/android/app/src/main/res/values/common_rsrc.xml b/xwords4/android/app/src/main/res/values/common_rsrc.xml
index ecf62b8ed..e5e1e255f 100644
--- a/xwords4/android/app/src/main/res/values/common_rsrc.xml
+++ b/xwords4/android/app/src/main/res/values/common_rsrc.xml
@@ -92,8 +92,8 @@
   <string name="key_udp_interval">key_udp_interval</string>
 
   <string name="key_notagain_sync">key_notagain_sync</string>
-  <!-- <string name="key_notagain_sms_ready">key_notagain_sms_ready</string> -->
   <string name="key_notagain_newselect">key_notagain_newselect</string>
+  <string name="key_notagain_emptybtscan">key_notagain_emptybtscan</string>
   <string name="key_notagain_backclears">key_notagain_backclears</string>
   <string name="key_notagain_chat">key_notagain_chat</string>
   <string name="key_notagain_relay">key_notagain_relay</string>
diff --git a/xwords4/android/app/src/main/res/values/strings.xml b/xwords4/android/app/src/main/res/values/strings.xml
index ddf5d2c8b..9108001c4 100644
--- a/xwords4/android/app/src/main/res/values/strings.xml
+++ b/xwords4/android/app/src/main/res/values/strings.xml
@@ -2732,4 +2732,10 @@
   <string name="foreground_channel_expl">Accepting Bluetooth in background</string>
   <!-- Explanation in settings for traditional move-arrived notification -->
   <string name="gameevent_channel_expl">In-game events</string>
+
+  <string name="not_again_emptybtscan">If a scan doesn\'t find the device you expect:\n
+  • First, just try again\n
+  • Make sure Bluetooth is on on the other device\n
+  • Launch CrossWords on the other device\n
+  </string>
 </resources>