diff --git a/solvrtech/symfony-logbook/1.0/config/packages/logbook.yaml b/solvrtech/symfony-logbook/1.0/config/packages/logbook.yaml
index 7602b379..b471990c 100644
--- a/solvrtech/symfony-logbook/1.0/config/packages/logbook.yaml
+++ b/solvrtech/symfony-logbook/1.0/config/packages/logbook.yaml
@@ -1,4 +1,18 @@
 logbook:
     api:
+        # The base url of logbook app.
         url: "%env(LOGBOOK_API_URL)%"
+
+        # The key of logbook client app.
         key: "%env(LOGBOOK_API_KEY)%"
+
+    # The minimum log level allowed to be stored.
+    # DEBUG
+    # INFO
+    # NOTICE
+    # WARNING
+    # ERROR
+    # CRITICAL
+    # ALERT
+    # EMERGENCY
+    level: "%env(LOGBOOK_LEVEL)%"
diff --git a/solvrtech/symfony-logbook/1.0/manifest.json b/solvrtech/symfony-logbook/1.0/manifest.json
index 1a1293a3..c154ee17 100644
--- a/solvrtech/symfony-logbook/1.0/manifest.json
+++ b/solvrtech/symfony-logbook/1.0/manifest.json
@@ -7,6 +7,7 @@
     },
     "env": {
         "LOGBOOK_API_URL": "Logbook API url",
-        "LOGBOOK_API_KEY": "Logbook API key"
+        "LOGBOOK_API_KEY": "Logbook API key",
+        "LOGBOOK_LEVEL": "ERROR"
     }
 }