diff --git a/plexapi/library.py b/plexapi/library.py
index 569645e1..9c705f4c 100644
--- a/plexapi/library.py
+++ b/plexapi/library.py
@@ -137,13 +137,12 @@ class Library(PlexObject):
         """
         self._server.query('/library/sections/all/refresh?force=1')
 
-    def deleteMediaPreview(self):
-        """ Delete the preview thumbnails for the all librarys.
-            This cannot be undone. Recreating media preview files can take hours
-            or even days.
+    def deleteMediaPreviews(self):
+        """ Delete the preview thumbnails for the all sections. This cannot be
+            undone. Recreating media preview files can take hours or even days.
         """
         for section in self.sections():
-            section.deleteMediaPreview()
+            section.deleteMediaPreviews()
 
 
 class LibrarySection(PlexObject):
@@ -261,10 +260,9 @@ class LibrarySection(PlexObject):
         key = '/library/sections/%s/refresh?force=1' % self.key
         self._server.query(key)
 
-    def deleteMediaPreview(self):
-        """ Delete the preview thumbnails for items in this library
-            This cannot be undone. Recreating media preview files can take hours
-            or even days.
+    def deleteMediaPreviews(self):
+        """ Delete the preview thumbnails for items in this library. This cannot
+            be undone. Recreating media preview files can take hours or even days.
         """
         key = '/library/sections/%s/indexes' % self.key
         self._server.query(key, method=self._server._session.delete)
diff --git a/tests/test_library.py b/tests/test_library.py
index 3f3907d1..99f2bdfa 100644
--- a/tests/test_library.py
+++ b/tests/test_library.py
@@ -99,8 +99,8 @@ def test_library_Library_cancelUpdate(pms):
     pms.library.cancelUpdate()
 
 
-def test_library_Library_deleteMediaPreview(pms):
-    pms.library.deleteMediaPreview()
+def test_library_Library_deleteMediaPreviews(pms):
+    pms.library.deleteMediaPreviews()
 
 
 def _test_library_MovieSection_refresh(a_movie_section):
@@ -114,8 +114,8 @@ def test_library_MovieSection_update(a_movie_section):
 def test_library_MovieSection_cancelUpdate(a_movie_section):
     a_movie_section.cancelUpdate()
 
-def test_librarty_deleteMediaPreview(a_movie_section):
-    a_movie_section.deleteMediaPreview()
+def test_librarty_deleteMediaPreviews(a_movie_section):
+    a_movie_section.deleteMediaPreviews()
 
 
 def _test_library_MovieSection_refresh(a_movie_section):