diff --git a/default_config/dev/config.yaml b/default_config/dev/config.yaml
index ae255c430..09c746827 100644
--- a/default_config/dev/config.yaml
+++ b/default_config/dev/config.yaml
@@ -34,7 +34,7 @@ FIREBASE:
   CLOUD_MESSAGING_ENABLED: false
   PROJECT_NUMBER: ''
   PROJECT_ID: ''
-  APPLICATION_ID: ''
+  APPLICATION_ID: '' #App ID field from the Firebase console or mobilesdk_app_id from the google-services.json file.
   API_KEY: ''
 
 SEGMENT_IO:
diff --git a/default_config/prod/config.yaml b/default_config/prod/config.yaml
index 804e4a45f..3cc0b6592 100644
--- a/default_config/prod/config.yaml
+++ b/default_config/prod/config.yaml
@@ -34,7 +34,7 @@ FIREBASE:
   CLOUD_MESSAGING_ENABLED: false
   PROJECT_NUMBER: ''
   PROJECT_ID: ''
-  APPLICATION_ID: ''
+  APPLICATION_ID: '' #App ID field from the Firebase console or mobilesdk_app_id from the google-services.json file.
   API_KEY: ''
 
 SEGMENT_IO:
diff --git a/default_config/stage/config.yaml b/default_config/stage/config.yaml
index 804e4a45f..3cc0b6592 100644
--- a/default_config/stage/config.yaml
+++ b/default_config/stage/config.yaml
@@ -34,7 +34,7 @@ FIREBASE:
   CLOUD_MESSAGING_ENABLED: false
   PROJECT_NUMBER: ''
   PROJECT_ID: ''
-  APPLICATION_ID: ''
+  APPLICATION_ID: '' #App ID field from the Firebase console or mobilesdk_app_id from the google-services.json file.
   API_KEY: ''
 
 SEGMENT_IO: