diff --git a/examples/example_014.php b/examples/example_014.php
index b6726f7..1908f5d 100644
--- a/examples/example_014.php
+++ b/examples/example_014.php
@@ -70,7 +70,7 @@ if (@file_exists(dirname(__FILE__).'/lang/eng.php')) {
 // IMPORTANT: disable font subsetting to allow users editing the document
 $pdf->setFontSubsetting(false);
 
-// set font
+// set font. 'helvetica' MUST be used to avoid a PHP notice from PHP 7.4+
 $pdf->setFont('helvetica', '', 10, '', false);
 
 // add a page
diff --git a/examples/example_052.php b/examples/example_052.php
index 7618aae..d6afcf5 100644
--- a/examples/example_052.php
+++ b/examples/example_052.php
@@ -87,7 +87,7 @@ $info = array(
 // set document signature
 $pdf->setSignature($certificate, $certificate, 'tcpdfdemo', '', 2, $info);
 
-// set font
+// set font. 'helvetica' MUST be used to avoid a PHP notice from PHP 7.4+
 $pdf->setFont('helvetica', '', 12);
 
 // add a page
diff --git a/examples/example_054.php b/examples/example_054.php
index 32f73c5..9214c51 100644
--- a/examples/example_054.php
+++ b/examples/example_054.php
@@ -69,7 +69,7 @@ if (@file_exists(dirname(__FILE__).'/lang/eng.php')) {
 // IMPORTANT: disable font subsetting to allow users editing the document
 $pdf->setFontSubsetting(false);
 
-// set font
+// set font. 'helvetica' MUST be used to avoid a PHP notice from PHP 7.4+
 $pdf->setFont('helvetica', '', 10, '', false);
 
 // add a page