diff --git a/Makefile b/Makefile
index 02148b43..33c54ddf 100644
--- a/Makefile
+++ b/Makefile
@@ -16,6 +16,7 @@ PERL_SCRIPTS = \
 	sbin/ngcp-sync-grants \
 	# EOL
 YAML_SCHEMAS = \
+	schemas/instances.yml \
 	schemas/sites.yml \
 	# EOL
 RESULTS ?= results
diff --git a/debian/ngcp-ngcpcfg.install b/debian/ngcp-ngcpcfg.install
index 7b80a78c..113bded8 100644
--- a/debian/ngcp-ngcpcfg.install
+++ b/debian/ngcp-ngcpcfg.install
@@ -20,6 +20,7 @@ sbin/ngcp-network-validator usr/sbin/
 sbin/ngcp-sync-constants    usr/sbin/
 sbin/ngcp-sync-grants       usr/sbin/
 sbin/ngcpcfg                usr/sbin/
+schemas/instances.yml       usr/share/ngcp-ngcpcfg/schemas/
 schemas/sites.yml           usr/share/ngcp-ngcpcfg/schemas/
 scripts/apply               usr/share/ngcp-ngcpcfg/scripts/
 scripts/build               usr/share/ngcp-ngcpcfg/scripts/
diff --git a/schemas/instances.yml b/schemas/instances.yml
new file mode 100644
index 00000000..8b5df091
--- /dev/null
+++ b/schemas/instances.yml
@@ -0,0 +1,17 @@
+name: instances.yml
+desc: Kwalify schema for NGCP instances.yml
+type: map
+mapping:
+  "sources":
+    type: seq
+    required: yes
+    sequence:
+      - type: map
+        required: yes
+        mapping:
+          "orig":   { type: str, required: yes,
+                      desc: "Specify the original service pathname." }
+          "dest":   { type: str, required: yes,
+                      desc: "Specify the destination service pathname." }
+          "label":  { type: str, required: yes,
+                      desc: "Specify service label." }
diff --git a/scripts/check b/scripts/check
index 9501da1b..7835dc0e 100755
--- a/scripts/check
+++ b/scripts/check
@@ -172,7 +172,7 @@ validate_config() {
       local schema
 
       case "${name}" in
-        sites.yml)
+        sites.yml|instances.yml)
           if ! [ -e "${f}" ]; then
             continue
           fi
@@ -275,7 +275,8 @@ check_shared_storage() {
 
 if [ "$*" = "" ] ; then
   SITES_FILE="${SITES_FILE:-${NGCPCTL_MAIN}/sites.yml}"
-  config_files="${NGCPCTL_CONFIG:-} ${NODE_CONFIG:-} ${PAIR_CONFIG:-} ${HOST_CONFIG:-} ${LOCAL_CONFIG:-} ${NETWORK_CONFIG:-} ${EXTRA_CONFIG_FILES[*]} ${CONSTANTS_CONFIG:-} ${SITES_FILE:-}"
+  INSTANCES_FILE="${INSTANCES_FILE:-${NGCPCTL_MAIN}/instances.yml}"
+  config_files="${NGCPCTL_CONFIG:-} ${NODE_CONFIG:-} ${PAIR_CONFIG:-} ${HOST_CONFIG:-} ${LOCAL_CONFIG:-} ${NETWORK_CONFIG:-} ${EXTRA_CONFIG_FILES[*]} ${CONSTANTS_CONFIG:-} ${SITES_FILE:-} ${INSTANCES_FILE:-}"
 else
   config_files="$*"
 fi