diff --git a/CMakeLists.txt b/CMakeLists.txt
index 516ed1a5e..62ee15c2c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,7 @@
 cmake_minimum_required(VERSION 3.14)
 
 project(dlite
-  VERSION 0.2.7
+  VERSION 0.3.0
   DESCRIPTION "Lightweight data-centric framework for working with scientific data"
   HOMEPAGE_URL "https://github.com/SINTEF/dlite"
   LANGUAGES C
diff --git a/src/dlite-storage-plugins.c b/src/dlite-storage-plugins.c
index 6e0bc9888..2a2d35254 100644
--- a/src/dlite-storage-plugins.c
+++ b/src/dlite-storage-plugins.c
@@ -242,7 +242,7 @@ char *dlite_storage_plugin_path_string(void)
 
   If `n` is out of range, it is clipped.
 
-  Returns non-zero on error.
+  Returns the index of the newly inserted element or -1 on error.
 */
 int dlite_storage_plugin_path_insert(int n, const char *path)
 {
@@ -254,7 +254,7 @@ int dlite_storage_plugin_path_insert(int n, const char *path)
 /*
   Appends `path` into the current search path.
 
-  Returns non-zero on error.
+  Returns the index of the newly appended element or -1 on error.
 */
 int dlite_storage_plugin_path_append(const char *path)
 {
@@ -267,7 +267,7 @@ int dlite_storage_plugin_path_append(const char *path)
   Like dlite_storage_plugin_path_append(), but appends at most the
   first `n` bytes of `path` to the current search path.
 
-  Returns non-zero on error.
+  Returns the index of the newly appended element or -1 on error.
 */
 int dlite_storage_plugin_path_appendn(const char *path, size_t n)
 {
diff --git a/storages/python/tests/test_postgresql_storage.c b/storages/python/tests/test_postgresql_storage.c
index e9b0a690f..fb3b24fd6 100644
--- a/storages/python/tests/test_postgresql_storage.c
+++ b/storages/python/tests/test_postgresql_storage.c
@@ -33,7 +33,9 @@ MU_TEST(test_save)
   float age = 42.;
   const char *skills[] = {"jumping", "hopping"};
   int n, i;
+  char *paths = STRINGIFY(dlite_SOURCE_DIR) "/storage/python/tests/*.json";
 
+  mu_check(dlite_storage_plugin_path_append(paths) >= 0);
   mu_check((meta = dlite_instance_load_url("json://Person.json?mode=r")));
   mu_check((inst = dlite_instance_create((DLiteMeta *)meta, dims, "ada")));
   mu_assert_int_eq(0, dlite_instance_set_property(inst, "name", &name));
diff --git a/tools/tests/Chemistry-0.1.json b/tools/tests/Chemistry-0.1.json
index b25b800cd..32c722e04 100644
--- a/tools/tests/Chemistry-0.1.json
+++ b/tools/tests/Chemistry-0.1.json
@@ -83,4 +83,4 @@
     }
   ],
   "dataname": "http://sintef.no/calm/0.1/Chemistry"
-}
+}
\ No newline at end of file