diff --git a/reference/image/functions/imagecreatefromwebp.xml b/reference/image/functions/imagecreatefromwebp.xml
index a4c151cc0c..cc50a201ce 100644
--- a/reference/image/functions/imagecreatefromwebp.xml
+++ b/reference/image/functions/imagecreatefromwebp.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- $Rev$ -->
+<!-- $Revision$ -->
 <refentry xml:id="function.imagecreatefromwebp" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>imagecreatefromwebp</refname>
diff --git a/reference/image/functions/imageflip.xml b/reference/image/functions/imageflip.xml
index e279474f98..5e41e33d6f 100644
--- a/reference/image/functions/imageflip.xml
+++ b/reference/image/functions/imageflip.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- $Rev$ -->
+<!-- $Revision$ -->
 <refentry xml:id="function.imageflip" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>imageflip</refname>
diff --git a/reference/image/functions/imagewebp.xml b/reference/image/functions/imagewebp.xml
index d881e449c0..81e2cf54d1 100644
--- a/reference/image/functions/imagewebp.xml
+++ b/reference/image/functions/imagewebp.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!-- $Rev$ -->
+<!-- $Revision$ -->
 <refentry xml:id="function.imagewebp" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>imagewebp</refname>