diff --git a/src/PIL/WebPImagePlugin.py b/src/PIL/WebPImagePlugin.py
index e9a7aac77..81ed550d9 100644
--- a/src/PIL/WebPImagePlugin.py
+++ b/src/PIL/WebPImagePlugin.py
@@ -99,6 +99,12 @@ class WebPImageFile(ImageFile.ImageFile):
         return self.getexif()._get_merged_dict()
 
     def getxmp(self):
+        """
+        Returns a dictionary containing the XMP tags.
+        Requires defusedxml to be installed.
+
+        :returns: XMP tags in a dictionary.
+        """
         return self._getxmp(self.info["xmp"]) if "xmp" in self.info else {}
 
     def seek(self, frame):