diff --git a/pg_service_parser/conf/service_settings.py b/pg_service_parser/conf/service_settings.py
index 8511c56..ccf89d8 100644
--- a/pg_service_parser/conf/service_settings.py
+++ b/pg_service_parser/conf/service_settings.py
@@ -1,12 +1,22 @@
 # Settings available for manual addition
 # See https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-PARAMKEYWORDS
 SERVICE_SETTINGS = {
-    "host": "localhost",
-    "port": "5432",
-    "dbname": "test",
-    "user": "",
-    "password": "",
-    "passfile": "",
+    "host": {"default": "localhost", "description": "Name of host to connect to."},
+    "port": {"default": "5432", "description": "Port number to connect to at the server host."},
+    "dbname": {"default": "test", "description": "The database name."},
+    "user": {"default": "", "description": "PostgreSQL user name to connect as."},
+    "password": {
+        "default": "",
+        "description": "Password to be used if the server demands password authentication.",
+    },
+    "sslmode": {
+        "default": "",
+        "description": "This option determines whether or with what priority a secure SSL TCP/IP connection will be negotiated with the server.",
+    },
+    "passfile": {
+        "default": "",
+        "description": "Specifies the name of the file used to store passwords.",
+    },
 }
 
 # Settings to initialize new files
diff --git a/pg_service_parser/core/item_models.py b/pg_service_parser/core/item_models.py
index f4191d2..5de0b65 100644
--- a/pg_service_parser/core/item_models.py
+++ b/pg_service_parser/core/item_models.py
@@ -1,6 +1,8 @@
 from qgis.PyQt.QtCore import QAbstractTableModel, QModelIndex, Qt, pyqtSignal
 from qgis.PyQt.QtGui import QColorConstants, QFont
 
+from pg_service_parser.conf.service_settings import SERVICE_SETTINGS
+
 
 class ServiceConfigModel(QAbstractTableModel):
     KEY_COL = 0
@@ -13,6 +15,7 @@ def __init__(self, service_name: str, service_config: dict):
         self.__service_name = service_name
         self.__model_data = service_config
         self.__original_data = service_config.copy()
+        self.__settings_data = SERVICE_SETTINGS  # Read-only dict with further info about settings
         self.__dirty = False
 
     def rowCount(self, parent=QModelIndex()):
@@ -24,7 +27,7 @@ def columnCount(self, parent=QModelIndex()):
     def index_to_setting_key(self, index):
         return list(self.__model_data.keys())[index.row()]
 
-    def add_settings(self, settings: dict):
+    def add_settings(self, settings: dict[str, str]):
         self.beginInsertRows(QModelIndex(), self.rowCount(), self.rowCount() + len(settings) - 1)
         self.__model_data.update(settings)
         self.__set_dirty_status(True)
@@ -55,6 +58,13 @@ def data(self, index, role=Qt.ItemDataRole.DisplayRole):
                 return key
             elif index.column() == self.VALUE_COL:
                 return self.__model_data[key]
+        elif role == Qt.ItemDataRole.ToolTipRole:
+            if index.column() == self.KEY_COL:
+                return (
+                    self.__settings_data[key].get("description", None)
+                    if key in self.__settings_data
+                    else None
+                )
         elif role == Qt.ItemDataRole.EditRole and index.column() == self.VALUE_COL:
             return self.__model_data[key]
         elif role == Qt.ItemDataRole.FontRole:
diff --git a/pg_service_parser/gui/dlg_pg_service.py b/pg_service_parser/gui/dlg_pg_service.py
index c4f55d1..d0eae50 100644
--- a/pg_service_parser/gui/dlg_pg_service.py
+++ b/pg_service_parser/gui/dlg_pg_service.py
@@ -211,7 +211,9 @@ def __add_settings_clicked(self):
         dlg.exec()
 
         if dlg.settings_to_add:
-            settings = {k: v for k, v in SERVICE_SETTINGS.items() if k in dlg.settings_to_add}
+            settings = {
+                k: v["default"] for k, v in SERVICE_SETTINGS.items() if k in dlg.settings_to_add
+            }
             self.__edit_model.add_settings(settings)
 
     @pyqtSlot()
diff --git a/pg_service_parser/gui/dlg_service_settings.py b/pg_service_parser/gui/dlg_service_settings.py
index e74d591..ad6eeab 100644
--- a/pg_service_parser/gui/dlg_service_settings.py
+++ b/pg_service_parser/gui/dlg_service_settings.py
@@ -1,5 +1,5 @@
-from qgis.PyQt.QtCore import pyqtSlot
-from qgis.PyQt.QtWidgets import QDialog
+from qgis.PyQt.QtCore import Qt, pyqtSlot
+from qgis.PyQt.QtWidgets import QDialog, QDialogButtonBox, QListWidgetItem
 
 from pg_service_parser.conf.service_settings import SERVICE_SETTINGS
 from pg_service_parser.utils import get_ui_class
@@ -9,16 +9,33 @@
 
 class ServiceSettingsDialog(QDialog, DIALOG_UI):
 
-    def __init__(self, parent, settings_to_hide: list[str]):
+    def __init__(self, parent, used_settings: list[str]):
         QDialog.__init__(self, parent)
         self.setupUi(self)
 
+        self.lstSettings.itemSelectionChanged.connect(self.__selection_changed)
         self.buttonBox.accepted.connect(self.__accepted)
 
-        settings = set(SERVICE_SETTINGS.keys()) - set(settings_to_hide)
-        self.lstSettings.addItems(settings)
+        self.__selection_changed()  # Initialize button status
+
+        # Load data
+        for setting, data in SERVICE_SETTINGS.items():
+            item = QListWidgetItem(setting)
+            if setting in used_settings:
+                item.setFlags(item.flags() & ~Qt.ItemIsSelectable & ~Qt.ItemIsEnabled)
+            if data.get("description", None):
+                item.setToolTip(data["description"])
+
+            self.lstSettings.addItem(item)
+
         self.settings_to_add = []
 
+    @pyqtSlot()
+    def __selection_changed(self):
+        self.buttonBox.button(QDialogButtonBox.Ok).setEnabled(
+            bool(self.lstSettings.selectedItems())
+        )
+
     @pyqtSlot()
     def __accepted(self):
         self.settings_to_add = [item.text() for item in self.lstSettings.selectedItems()]