diff --git a/molecule/specs/plugins/remaster_plugin.py b/molecule/specs/plugins/remaster_plugin.py
index 83588b7..b0a7367 100644
--- a/molecule/specs/plugins/remaster_plugin.py
+++ b/molecule/specs/plugins/remaster_plugin.py
@@ -328,6 +328,22 @@ class RemasterSpec(GenericSpec):
                 'cb': self.valid_exec_first_list_item,
                 've': self.ve_string_splitter,
             },
+            'release_string': {
+                'cb': self.ne_string, # validation callback
+                've': self.ve_string_stripper, # value extractor
+            },
+            'release_version': {
+                'cb': self.ne_string,
+                've': self.ve_string_stripper,
+            },
+            'release_desc': {
+                'cb': self.ne_string,
+                've': self.ve_string_stripper,
+            },
+            'release_file': {
+                'cb': self.ne_string,
+                've': self.ve_string_stripper,
+            },
             'source_iso': {
                 'cb': self.valid_path_string,
                 've': self.ve_string_stripper,
diff --git a/molecule/specs/plugins/tar_plugin.py b/molecule/specs/plugins/tar_plugin.py
index 8c53b63..ec09dac 100644
--- a/molecule/specs/plugins/tar_plugin.py
+++ b/molecule/specs/plugins/tar_plugin.py
@@ -129,6 +129,22 @@ class IsoToTarSpec(GenericSpec):
                 'cb': self.valid_exec_first_list_item,
                 've': self.ve_string_splitter,
             },
+            'release_string': {
+                'cb': self.ne_string, # validation callback
+                've': self.ve_string_stripper, # value extractor
+            },
+            'release_version': {
+                'cb': self.ne_string,
+                've': self.ve_string_stripper,
+            },
+            'release_desc': {
+                'cb': self.ne_string,
+                've': self.ve_string_stripper,
+            },
+            'release_file': {
+                'cb': self.ne_string,
+                've': self.ve_string_stripper,
+            },
             'source_iso': {
                 'cb': self.valid_path_string,
                 've': self.ve_string_stripper,