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-rw-r--r--sirtopnm.html2
1 files changed, 1 insertions, 1 deletions
diff --git a/sirtopnm.html b/sirtopnm.html
index 44c44e71..9bbede6f 100644
--- a/sirtopnm.html
+++ b/sirtopnm.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.3//EN">
 <html><head><title>Sirtopnm User Manual</title></head>
 <body>
 <h1>sirtopnm</h1>