diff --git a/reference/image/functions/jpeg2wbmp.xml b/reference/image/functions/jpeg2wbmp.xml
index 47810a96b2..432f1dabd7 100644
--- a/reference/image/functions/jpeg2wbmp.xml
+++ b/reference/image/functions/jpeg2wbmp.xml
@@ -5,6 +5,17 @@
   <refname>jpeg2wbmp</refname>
   <refpurpose>Convert JPEG image file to WBMP image file</refpurpose>
  </refnamediv>
+
+ <refsynopsisdiv>
+  <warning>
+   <para>
+    <function>jpeg2wbmp</function> has been deprecated as of PHP 7.2.0, and will
+    be removed as of PHP 8.0.0. Use <function>imagecreatefromjpeg</function> and
+    <function>imagewbmp</function> instead.
+   </para>
+  </warning>
+ </refsynopsisdiv>
+
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>
diff --git a/reference/image/functions/png2wbmp.xml b/reference/image/functions/png2wbmp.xml
index 659ced2046..c03af3b696 100644
--- a/reference/image/functions/png2wbmp.xml
+++ b/reference/image/functions/png2wbmp.xml
@@ -5,6 +5,17 @@
   <refname>png2wbmp</refname>
   <refpurpose>Convert PNG image file to WBMP image file</refpurpose>
  </refnamediv>
+
+ <refsynopsisdiv>
+  <warning>
+   <para>
+    <function>png2wbmp</function> has been deprecated as of PHP 7.2.0, and will
+    be removed as of PHP 8.0.0. Use <function>imagecreatefrompng</function> and
+    <function>imagewbmp</function> instead.
+   </para>
+  </warning>
+ </refsynopsisdiv>
+
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>