diff --git a/apache/php.ini.in b/apache/php.ini.in
index a21a9c22ecf76a833d39f85ce1c17cf756301424..00a1f69b83cc8d96b998ab73c0b2c4f3838826f9 100644
--- a/apache/php.ini.in
+++ b/apache/php.ini.in
@@ -1,5 +1,7 @@
 [PHP]
 ; Added for update 5.21
+; This file Added by Emulab - Version: 5.X
+; Do not remove the above line.
 
 ;
 ; So that quotes are not escaped. Needed for netbuild application.
diff --git a/apache/v1/httpd.conf-ops.in b/apache/v1/httpd.conf-ops.in
index a6f29fbf396c58fa6031a0d149e9bee253b8a699..86b3945bb689e901a5b78d1733436d11c68a0de6 100644
--- a/apache/v1/httpd.conf-ops.in
+++ b/apache/v1/httpd.conf-ops.in
@@ -2,6 +2,9 @@
 ## httpd.conf -- Apache HTTP server configuration file
 ##
 
+##
+## This file Added by Emulab - Version: 5.X
+## Do not remove the above line.
 ##
 ## This file is intended for use by sites running the emulab software. It
 ## was installed by the testbed installation process.
diff --git a/apache/v1/httpd.conf.in b/apache/v1/httpd.conf.in
index a43d3ecb23d7d7fbc398f2276e5a24514f94a8c3..03f13aab516b7503e6a45a460f0b7a73367d65b5 100644
--- a/apache/v1/httpd.conf.in
+++ b/apache/v1/httpd.conf.in
@@ -2,6 +2,9 @@
 ## apache.conf -- Apache HTTP server configuration file
 ##
 
+##
+## This file Added by Emulab - Version: 5.X
+## Do not remove the above line.
 ##
 ## This file is intended for use by sites running the emulab software. It
 ## was installed by the testbed installation process.
diff --git a/apache/v2/httpd.conf-ops.in b/apache/v2/httpd.conf-ops.in
index 4860059db59304d113061aa799c935fb600e21ef..7a3fcd9ba3a2c3848c54d11eb264fef59aed64b0 100644
--- a/apache/v2/httpd.conf-ops.in
+++ b/apache/v2/httpd.conf-ops.in
@@ -1,3 +1,11 @@
+##
+## This file Added by Emulab - Version: 5.X
+## Do not remove the above line.
+##
+## This file is intended for use by sites running the emulab software. It
+## was installed by the testbed installation process.
+##
+
 #
 # This is the main Apache server configuration file.  It contains the
 # configuration directives that give the server its instructions.
diff --git a/apache/v2/httpd.conf.in b/apache/v2/httpd.conf.in
index cf3cb7fc238cdbc5151d679e0268a787b6f73824..defe2e4f83a5e32157105d657fb41eec835b0387 100644
--- a/apache/v2/httpd.conf.in
+++ b/apache/v2/httpd.conf.in
@@ -1,3 +1,11 @@
+##
+## This file Added by Emulab - Version: 5.X
+## Do not remove the above line.
+##
+## This file is intended for use by sites running the emulab software. It
+## was installed by the testbed installation process.
+##
+
 #
 # This is the main Apache server configuration file.  It contains the
 # configuration directives that give the server its instructions.