diff --git a/schema/ttrss_schema_mysql.sql b/schema/ttrss_schema_mysql.sql
index 5e6ca609..3f63d44e 100644
--- a/schema/ttrss_schema_mysql.sql
+++ b/schema/ttrss_schema_mysql.sql
@@ -57,6 +57,9 @@ create table ttrss_feed_categories(id integer not null primary key auto_incremen
 	title varchar(200) not null,
 	collapsed bool not null default false,
 	order_id integer not null default 0,
+	parent_cat integer,
+	index(parent_cat),
+	foreign key (parent_cat) references ttrss_feed_categories(id) ON DELETE SET NULL,
 	index(owner_uid),
 	foreign key (owner_uid) references ttrss_users(id) ON DELETE CASCADE) ENGINE=InnoDB DEFAULT CHARSET=UTF8;
 
@@ -267,7 +270,7 @@ create table ttrss_tags (id integer primary key auto_increment,
 
 create table ttrss_version (schema_version int not null) ENGINE=InnoDB DEFAULT CHARSET=UTF8;
 
-insert into ttrss_version values (92);
+insert into ttrss_version values (93);
 
 create table ttrss_enclosures (id integer primary key auto_increment,
 	content_url text not null,
diff --git a/schema/ttrss_schema_pgsql.sql b/schema/ttrss_schema_pgsql.sql
index 3e0d800c..d5d3f88f 100644
--- a/schema/ttrss_schema_pgsql.sql
+++ b/schema/ttrss_schema_pgsql.sql
@@ -52,6 +52,7 @@ create table ttrss_feed_categories(id serial not null primary key,
 	owner_uid integer not null references ttrss_users(id) on delete cascade,
 	collapsed boolean not null default false,
 	order_id integer not null default 0,
+	parent_cat integer references ttrss_feed_categories(id) on delete set null,
 	title varchar(200) not null);
 
 create table ttrss_feeds (id serial not null primary key,
@@ -231,7 +232,7 @@ create index ttrss_tags_post_int_id_idx on ttrss_tags(post_int_id);
 
 create table ttrss_version (schema_version int not null);
 
-insert into ttrss_version values (92);
+insert into ttrss_version values (93);
 
 create table ttrss_enclosures (id serial not null primary key,
 	content_url text not null,
diff --git a/schema/versions/mysql/93.sql b/schema/versions/mysql/93.sql
new file mode 100644
index 00000000..56b96e3b
--- /dev/null
+++ b/schema/versions/mysql/93.sql
@@ -0,0 +1,10 @@
+begin;
+
+alter table ttrss_feed_categories add column parent_cat integer;
+update ttrss_feed_categories set parent_cat = NULL;
+
+alter table ttrss_feed_categories add FOREIGN KEY (parent_cat) REFERENCES ttrss_feed_categories(id) ON DELETE SET NULL;
+
+update ttrss_version set schema_version = 93;
+
+commit;
diff --git a/schema/versions/pgsql/93.sql b/schema/versions/pgsql/93.sql
new file mode 100644
index 00000000..0374c0b0
--- /dev/null
+++ b/schema/versions/pgsql/93.sql
@@ -0,0 +1,10 @@
+begin;
+
+alter table ttrss_feed_categories add column parent_cat integer;
+update ttrss_feed_categories set parent_cat = NULL;
+
+alter table ttrss_feed_categories add constraint "$2" FOREIGN KEY (parent_cat) REFERENCES ttrss_feed_categories(id) ON DELETE SET NULL;
+
+update ttrss_version set schema_version = 93;
+
+commit;