diff --git a/src/PuzzleTools.livecodescript b/src/PuzzleTools.livecodescript
index 76806cb..dbe7b51 100644
--- a/src/PuzzleTools.livecodescript
+++ b/src/PuzzleTools.livecodescript
@@ -4,7 +4,7 @@ function toNumber pChar
    local tNum
    put chartonum(toUpper(pChar)) - 64 into tNum
    if tNum < 1 or tNum > 26 then
-      throw "char not alphabetical"
+      throw "char not in the range A to Z"
    else
       return tNum
    end if
diff --git a/tests/test-scripts/test.livecodescript b/tests/test-scripts/test.livecodescript
index de68a56..a2e7899 100644
--- a/tests/test-scripts/test.livecodescript
+++ b/tests/test-scripts/test.livecodescript
@@ -44,7 +44,7 @@ on TestLetterToNumber
     end repeat
 
     TestAssertUserThrows "non alphabetic input to toNumber function throws", \
-            "LetterToNumberThrow", "char not alphabetical"
+            "LetterToNumberThrow", "char not in the range A to Z"
 end TestLetterToNumber
 
 on TestLetterFromNumber