diff --git a/platypush/config/config.yaml b/platypush/config/config.yaml
index df1ec68a..b0005cb9 100644
--- a/platypush/config/config.yaml
+++ b/platypush/config/config.yaml
@@ -280,6 +280,35 @@ backend.http:
 #         - platypush/tests
 ###
 
+###
+# # Example configuration of a voice assistant.
+# # Several voice assistant plugins and engines are available - Google
+# # Assistant, Alexa, DeepSpeech, Picovoice etc.
+# #
+# # The Google Assistant is probably the most straightforward to configure and
+# # the richest in terms of features provided out-of-the-box and speech
+# # detection quality, while others may require further tinkering, may perform
+# # worse than the Google model, and/or may run models on-device which could not
+# # be within reach for some machines.
+# #
+# # Check the documentation of the `assistant.google` plugin for instructions on
+# # how to get a credentials file that you can use with a custom assistant
+# # installation.
+# #
+# # Note however that the Google Assistant plugin leverages the
+# # `google-assistant-library`, which has been deprecated a while ago by Google
+# # and it's unlikely to receive updates (although it still works and I'd still
+# # expect it to work).
+#
+# assistant.google:
+#   # Path to your credentials file (by default it will look either under
+#   # ~/.config/google-oauthlib-tool/credentials.json or
+#   # <WORKDIR>/credentials/google/assistant.json
+#   # credentials_file: ~/credentials/assistant.json
+#   # If specified, then this sound will be played when a conversation starts
+#   # conversation_start_sound: ~/sounds/assistant-start.mp3
+###
+
 ###
 # # Example configuration of music.mpd plugin, a plugin to interact with MPD and
 # # Mopidy music server instances. See
diff --git a/platypush/plugins/assistant/google/__init__.py b/platypush/plugins/assistant/google/__init__.py
index 5623d278..07c02d06 100644
--- a/platypush/plugins/assistant/google/__init__.py
+++ b/platypush/plugins/assistant/google/__init__.py
@@ -102,7 +102,7 @@ class AssistantGooglePlugin(AssistantPlugin, RunnablePlugin):
     @property
     def credentials_file(self) -> str:
         if self._credentials_file:
-            return self._credentials_file
+            return os.path.abspath(os.path.expanduser(self._credentials_file))
 
         f = None
         for default_file in self._default_credentials_files: