diff --git a/properties.schema b/properties.schema
index ab69e912..de5310d1 100644
--- a/properties.schema
+++ b/properties.schema
@@ -341,6 +341,16 @@
                 },
                 "default": "bottom",
                 "editorOnly": true
+              },
+              "_classes": {
+                "type": "string",
+                "required": false,
+                "default": "",
+                "title": "Tooltip classes",
+                "inputType": "Text",
+                "validators": [],
+                "help": "Allows you to specify custom CSS classes to be applied to the tooltip.",
+                "translatable": false
               }
             }
           },
diff --git a/schema/component.schema.json b/schema/component.schema.json
index cb42bdab..61b7e2cc 100644
--- a/schema/component.schema.json
+++ b/schema/component.schema.json
@@ -342,6 +342,13 @@
                     "_adapt": {
                       "editorOnly": true
                     }
+                  },
+                  "_classes": {
+                    "type": "string",
+                    "default": "",
+                    "title": "Tooltip classes",
+                    "description": "Allows you to specify custom CSS classes to be applied to the tooltip.",
+                    "translatable": false
                   }
                 }
               }