diff --git a/src/ejabberd_auth_internal.erl b/src/ejabberd_auth_internal.erl
index 8aa07b238..ac2208478 100644
--- a/src/ejabberd_auth_internal.erl
+++ b/src/ejabberd_auth_internal.erl
@@ -1,7 +1,7 @@
 %%%----------------------------------------------------------------------
 %%% File    : ejabberd_auth_internal.erl
 %%% Author  : Alexey Shchepin <alexey@process-one.net>
-%%% Purpose : Authentification via mnesia
+%%% Purpose : Authentification via mnesia (obsolete)
 %%% Created : 12 Dec 2004 by Alexey Shchepin <alexey@process-one.net>
 %%%
 %%%
diff --git a/src/ejabberd_auth_odbc.erl b/src/ejabberd_auth_odbc.erl
index 8227b241d..e169da98d 100644
--- a/src/ejabberd_auth_odbc.erl
+++ b/src/ejabberd_auth_odbc.erl
@@ -1,7 +1,7 @@
 %%%----------------------------------------------------------------------
 %%% File    : ejabberd_auth_odbc.erl
 %%% Author  : Alexey Shchepin <alexey@process-one.net>
-%%% Purpose : Authentification via ODBC
+%%% Purpose : Authentification via ODBC (obsolete)
 %%% Created : 12 Dec 2004 by Alexey Shchepin <alexey@process-one.net>
 %%%
 %%%
diff --git a/src/mod_last_odbc.erl b/src/mod_last_odbc.erl
index a9366e629..d05580de3 100644
--- a/src/mod_last_odbc.erl
+++ b/src/mod_last_odbc.erl
@@ -1,7 +1,7 @@
 %%%----------------------------------------------------------------------
 %%% File    : mod_last_odbc.erl
 %%% Author  : Alexey Shchepin <alexey@process-one.net>
-%%% Purpose : jabber:iq:last support (XEP-0012)
+%%% Purpose : jabber:iq:last support (XEP-0012) for ODBC (obsolete)
 %%% Created : 24 Oct 2003 by Alexey Shchepin <alexey@process-one.net>
 %%%
 %%%
diff --git a/src/mod_offline_odbc.erl b/src/mod_offline_odbc.erl
index 07ef34506..0896d1044 100644
--- a/src/mod_offline_odbc.erl
+++ b/src/mod_offline_odbc.erl
@@ -1,7 +1,7 @@
 %%%----------------------------------------------------------------------
 %%% File    : mod_offline_odbc.erl
 %%% Author  : Alexey Shchepin <alexey@process-one.net>
-%%% Purpose : Store and manage offline messages in relational database.
+%%% Purpose : Store and manage offline messages in relational database (obsolete)
 %%% Created :  5 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
 %%%
 %%%
diff --git a/src/mod_privacy_odbc.erl b/src/mod_privacy_odbc.erl
index 5f039ef1e..025b2d79b 100644
--- a/src/mod_privacy_odbc.erl
+++ b/src/mod_privacy_odbc.erl
@@ -1,7 +1,7 @@
 %%%----------------------------------------------------------------------
 %%% File    : mod_privacy_odbc.erl
 %%% Author  : Alexey Shchepin <alexey@process-one.net>
-%%% Purpose : jabber:iq:privacy support
+%%% Purpose : jabber:iq:privacy support for ODBC database (obsolete)
 %%% Created :  5 Oct 2006 by Alexey Shchepin <alexey@process-one.net>
 %%%
 %%%
diff --git a/src/mod_private_odbc.erl b/src/mod_private_odbc.erl
index ab32552d8..1b188799b 100644
--- a/src/mod_private_odbc.erl
+++ b/src/mod_private_odbc.erl
@@ -1,7 +1,7 @@
 %%%----------------------------------------------------------------------
 %%% File    : mod_private_odbc.erl
 %%% Author  : Alexey Shchepin <alexey@process-one.net>
-%%% Purpose : Private storage support
+%%% Purpose : Private storage support in ODBC (obsolete)
 %%% Created :  5 Oct 2006 by Alexey Shchepin <alexey@process-one.net>
 %%%
 %%%
diff --git a/src/mod_roster_odbc.erl b/src/mod_roster_odbc.erl
index 4dd824b52..14de60a44 100644
--- a/src/mod_roster_odbc.erl
+++ b/src/mod_roster_odbc.erl
@@ -1,7 +1,7 @@
 %%%----------------------------------------------------------------------
 %%% File    : mod_roster_odbc.erl
 %%% Author  : Alexey Shchepin <alexey@process-one.net>
-%%% Purpose : Roster management
+%%% Purpose : Roster management for ODBC (obsolete)
 %%% Created : 15 Dec 2004 by Alexey Shchepin <alexey@process-one.net>
 %%%
 %%%
diff --git a/src/mod_vcard_odbc.erl b/src/mod_vcard_odbc.erl
index 158ac4713..bb0ad5ca8 100644
--- a/src/mod_vcard_odbc.erl
+++ b/src/mod_vcard_odbc.erl
@@ -1,7 +1,7 @@
 %%%----------------------------------------------------------------------
 %%% File    : mod_vcard.erl
 %%% Author  : Alexey Shchepin <alexey@process-one.net>
-%%% Purpose : vCard support via ODBC
+%%% Purpose : vCard support via ODBC (obsolete)
 %%% Created :  2 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
 %%%
 %%%