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-rw-r--r--doc/html/accumulators/acknowledgements.html1
1 files changed, 1 insertions, 0 deletions
diff --git a/doc/html/accumulators/acknowledgements.html b/doc/html/accumulators/acknowledgements.html
index e2cca73e6e..e9f72ae743 100644
--- a/doc/html/accumulators/acknowledgements.html
+++ b/doc/html/accumulators/acknowledgements.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">