diff --git a/sql/upgrades/177.sql b/sql/upgrades/177.sql
new file mode 100644
--- /dev/null
+++ b/sql/upgrades/177.sql
@@ -0,0 +1,9 @@
+-- SWH DB schema upgrade
+-- from_version: 176
+-- to_version: 177
+-- description: add cvs to revision_type values
+
+insert into dbversion(version, release, description)
+      values(177, now(), 'Work In Progress');
+
+alter type revision_type add value 'cvs';
diff --git a/swh/storage/postgresql/db.py b/swh/storage/postgresql/db.py
--- a/swh/storage/postgresql/db.py
+++ b/swh/storage/postgresql/db.py
@@ -30,7 +30,7 @@
 
     """
 
-    current_version = 176
+    current_version = 177
 
     def mktemp_dir_entry(self, entry_type, cur=None):
         self._cursor(cur).execute(
diff --git a/swh/storage/sql/20-enums.sql b/swh/storage/sql/20-enums.sql
--- a/swh/storage/sql/20-enums.sql
+++ b/swh/storage/sql/20-enums.sql
@@ -5,7 +5,7 @@
 create type content_status as enum ('absent', 'visible', 'hidden');
 comment on type content_status is 'Content visibility';
 
-create type revision_type as enum ('git', 'tar', 'dsc', 'svn', 'hg');
+create type revision_type as enum ('git', 'tar', 'dsc', 'svn', 'hg', 'cvs');
 comment on type revision_type is 'Possible revision types';
 
 create type object_type as enum ('content', 'directory', 'revision', 'release', 'snapshot');
diff --git a/swh/storage/sql/30-schema.sql b/swh/storage/sql/30-schema.sql
--- a/swh/storage/sql/30-schema.sql
+++ b/swh/storage/sql/30-schema.sql
@@ -17,7 +17,7 @@
 
 -- latest schema version
 insert into dbversion(version, release, description)
-      values(176, now(), 'Work In Progress');
+      values(177, now(), 'Work In Progress');
 
 -- a SHA1 checksum
 create domain sha1 as bytea check (length(value) = 20);