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-rw-r--r--doc/html/ratio/appendices.html1
-rw-r--r--doc/html/ratio/reference.html1
-rw-r--r--doc/html/ratio/users_guide.html1
3 files changed, 3 insertions, 0 deletions
diff --git a/doc/html/ratio/appendices.html b/doc/html/ratio/appendices.html
index 0bedc3b57b..6102a45339 100644
--- a/doc/html/ratio/appendices.html
+++ b/doc/html/ratio/appendices.html
@@ -1,3 +1,4 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
diff --git a/doc/html/ratio/reference.html b/doc/html/ratio/reference.html
index 431cc49613..908b450ec1 100644
--- a/doc/html/ratio/reference.html
+++ b/doc/html/ratio/reference.html
@@ -1,3 +1,4 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
diff --git a/doc/html/ratio/users_guide.html b/doc/html/ratio/users_guide.html
index a769985fd4..37cb0f9c2a 100644
--- a/doc/html/ratio/users_guide.html
+++ b/doc/html/ratio/users_guide.html
@@ -1,3 +1,4 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">