diff --git a/lang/en/local_amos.php b/lang/en/local_amos.php
index fb75f10..342b33e 100644
--- a/lang/en/local_amos.php
+++ b/lang/en/local_amos.php
@@ -295,7 +295,7 @@
 $string['nologsfound'] = 'No strings found, please modify filters';
 $string['nostringsfound'] = 'No strings found';
 $string['nostringsfoundonpage'] = 'No strings found on page {$a}';
-$string['nostringtoimport'] = 'No valid string found in the file. Make sure the file has correct filename and is properly formatted.';
+$string['nostringtoimport'] = 'No valid string found in the file, or no version matching. Make sure the file has correct filename and is properly formatted. It could also be there\'s a version mismatch, e.g. you\'re submitting for 3.5 but there\'s no 3.5 version of the plugin.';
 $string['nothingtomerge'] = 'The source branch does not contain any new strings that would be missing at the target branch. Nothing to merge.';
 $string['nothingtostage'] = 'The operation did not return any string that could be staged.';
 $string['novalidzip'] = 'Unable to extract the ZIP file.';