diff --git a/tldp/doctypes/docbook4xml.py b/tldp/doctypes/docbook4xml.py
index 8e2060e..d09659c 100644
--- a/tldp/doctypes/docbook4xml.py
+++ b/tldp/doctypes/docbook4xml.py
@@ -6,7 +6,7 @@ from .common import SignatureChecker
 
 
 class Docbook4XML(SignatureChecker):
-    formatname = 'DocBook 4.x XML'
+    formatname = 'DocBook XML 4.x'
     extensions = ['.xml']
     signatures = ['-//OASIS//DTD DocBook XML V4.1.2//EN',
                   '-//OASIS//DTD DocBook XML V4.2//EN',
diff --git a/tldp/doctypes/docbook5xml.py b/tldp/doctypes/docbook5xml.py
index a8df49f..34ccdfd 100644
--- a/tldp/doctypes/docbook5xml.py
+++ b/tldp/doctypes/docbook5xml.py
@@ -5,7 +5,7 @@ from .common import SignatureChecker
 
 
 class Docbook5XML(SignatureChecker):
-    formatname = 'DocBook 5.x XML'
+    formatname = 'DocBook XML 5.x'
     extensions = ['.xml']
     signatures = ['-//OASIS//DTD DocBook V5.0/EN',
                   'http://docbook.org/ns/docbook', ]
diff --git a/tldp/doctypes/docbooksgml.py b/tldp/doctypes/docbooksgml.py
index 059d646..a730903 100644
--- a/tldp/doctypes/docbooksgml.py
+++ b/tldp/doctypes/docbooksgml.py
@@ -5,7 +5,7 @@ from .common import SignatureChecker
 
 
 class DocbookSGML(SignatureChecker):
-    formatname = 'DocBook 3.x and 4.x SGML'
+    formatname = 'DocBook SGML 3.x/4.x'
     extensions = ['.sgml']
     signatures = ['-//Davenport//DTD DocBook V3.0//EN',
                   '-//OASIS//DTD DocBook V3.1//EN',