Rename lzma.check_is_supported() to is_check_supported() to avoid grammatical confusion.
diff --git a/Lib/lzma.py b/Lib/lzma.py
index 5adf51f..1c101f7 100644
--- a/Lib/lzma.py
+++ b/Lib/lzma.py
@@ -18,7 +18,7 @@
     "MODE_FAST", "MODE_NORMAL", "PRESET_DEFAULT", "PRESET_EXTREME",
 
     "LZMACompressor", "LZMADecompressor", "LZMAFile", "LZMAError",
-    "compress", "decompress", "check_is_supported",
+    "compress", "decompress", "is_check_supported",
     "encode_filter_properties", "decode_filter_properties",
 ]
 
diff --git a/Lib/test/test_lzma.py b/Lib/test/test_lzma.py
index cc08bad..97523c1 100644
--- a/Lib/test/test_lzma.py
+++ b/Lib/test/test_lzma.py
@@ -935,14 +935,14 @@
     def test_is_check_supported(self):
         # CHECK_NONE and CHECK_CRC32 should always be supported,
         # regardless of the options liblzma was compiled with.
-        self.assertTrue(lzma.check_is_supported(lzma.CHECK_NONE))
-        self.assertTrue(lzma.check_is_supported(lzma.CHECK_CRC32))
+        self.assertTrue(lzma.is_check_supported(lzma.CHECK_NONE))
+        self.assertTrue(lzma.is_check_supported(lzma.CHECK_CRC32))
 
         # The .xz format spec cannot store check IDs above this value.
-        self.assertFalse(lzma.check_is_supported(lzma.CHECK_ID_MAX + 1))
+        self.assertFalse(lzma.is_check_supported(lzma.CHECK_ID_MAX + 1))
 
         # This value should not be a valid check ID.
-        self.assertFalse(lzma.check_is_supported(lzma.CHECK_UNKNOWN))
+        self.assertFalse(lzma.is_check_supported(lzma.CHECK_UNKNOWN))
 
     def test_encode_filter_properties(self):
         with self.assertRaises(TypeError):