diff --git a/data/tlg0027/tlg001/tlg0027.tlg001.perseus-grc2.xml b/data/tlg0027/tlg001/tlg0027.tlg001.perseus-grc2.xml
index 140a74fee..dd7959e16 100644
--- a/data/tlg0027/tlg001/tlg0027.tlg001.perseus-grc2.xml
+++ b/data/tlg0027/tlg001/tlg0027.tlg001.perseus-grc2.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <?xml-model href="http://www.stoa.org/epidoc/schema/latest/tei-epidoc.rng" type="application/xml" schematypens="http://relaxng.org/ns/structure/1.0"?>
 <TEI xmlns="http://www.tei-c.org/ns/1.0">
-	<teiHeader>
+	<teiHeader xml:lang="eng">
 		<fileDesc>
 			<titleStmt>
 				<title xml:lang="grc">Περὶ τῶν μυστηρίων</title>
diff --git a/data/tlg0027/tlg002/tlg0027.tlg002.perseus-grc2.xml b/data/tlg0027/tlg002/tlg0027.tlg002.perseus-grc2.xml
index cd8258980..64da052c7 100644
--- a/data/tlg0027/tlg002/tlg0027.tlg002.perseus-grc2.xml
+++ b/data/tlg0027/tlg002/tlg0027.tlg002.perseus-grc2.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <?xml-model href="http://www.stoa.org/epidoc/schema/latest/tei-epidoc.rng" type="application/xml" schematypens="http://relaxng.org/ns/structure/1.0"?>
 <TEI xmlns="http://www.tei-c.org/ns/1.0">
-	<teiHeader>
+	<teiHeader xml:lang="eng">
 		<fileDesc>
 			<titleStmt>
 				<title xml:lang="grc">Περὶ τῆς ἑαυτοῦ καθόδου</title>
diff --git a/data/tlg0027/tlg003/tlg0027.tlg003.perseus-grc2.xml b/data/tlg0027/tlg003/tlg0027.tlg003.perseus-grc2.xml
index 95f9d1b7e..1cddda5d9 100644
--- a/data/tlg0027/tlg003/tlg0027.tlg003.perseus-grc2.xml
+++ b/data/tlg0027/tlg003/tlg0027.tlg003.perseus-grc2.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <?xml-model href="http://www.stoa.org/epidoc/schema/latest/tei-epidoc.rng" type="application/xml" schematypens="http://relaxng.org/ns/structure/1.0"?>
 <TEI xmlns="http://www.tei-c.org/ns/1.0">
-	<teiHeader>
+	<teiHeader xml:lang="eng">
 		<fileDesc>
 			<titleStmt>
 				<title xml:lang="grc">Περὶ τῆς πρὸς Λακεδαιμονίους εἰρήνης</title>
diff --git a/data/tlg0027/tlg004/tlg0027.tlg004.perseus-grc2.xml b/data/tlg0027/tlg004/tlg0027.tlg004.perseus-grc2.xml
index a889e2c69..8d32399df 100644
--- a/data/tlg0027/tlg004/tlg0027.tlg004.perseus-grc2.xml
+++ b/data/tlg0027/tlg004/tlg0027.tlg004.perseus-grc2.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <?xml-model href="http://www.stoa.org/epidoc/schema/latest/tei-epidoc.rng" type="application/xml" schematypens="http://relaxng.org/ns/structure/1.0"?>
 <TEI xmlns="http://www.tei-c.org/ns/1.0">
-	<teiHeader>
+	<teiHeader xml:lang="eng">
 		<fileDesc>
 			<titleStmt>
 				<title xml:lang="grc">Κατὰ Ἀλκιβιάδου</title>