diff --git a/src/external/MuSRFitGUI/devel/MuSRFit.ui.h b/src/external/MuSRFitGUI/devel/MuSRFit.ui.h
index fa28c70f..5bf406ba 100755
--- a/src/external/MuSRFitGUI/devel/MuSRFit.ui.h
+++ b/src/external/MuSRFitGUI/devel/MuSRFit.ui.h
@@ -817,7 +817,7 @@ void MuSRFitform::AppendToFunctions()
     my $ConstLine="fun$i = $Constraint\n";
     FunctionsBlock->append($ConstLine);
     
-# Replace parameter in theory block with fun$1
+# Replace parameter in theory block with fun$i
     $Full_T_Block=~ s/$ParName/fun$i/;
     TheoryBlock->setText($Full_T_Block);
 }