diff --git a/tools/distrib/python/grpcio_tools/setup.py b/tools/distrib/python/grpcio_tools/setup.py
index bc35310047f..a316038d05d 100644
--- a/tools/distrib/python/grpcio_tools/setup.py
+++ b/tools/distrib/python/grpcio_tools/setup.py
@@ -124,24 +124,25 @@ if EXTRA_ENV_COMPILE_ARGS is None:
         EXTRA_ENV_COMPILE_ARGS += ' -fno-wrapv -frtti'
 if EXTRA_ENV_LINK_ARGS is None:
     EXTRA_ENV_LINK_ARGS = ''
-    # NOTE(rbellevi): Clang on Mac OS will make all static symbols (both variables
-    # and objects) global weak symbols. When a process loads the
+    # NOTE(rbellevi): Clang on Mac OS will make all static symbols (both
+    # variables and objects) global weak symbols. When a process loads the
     # protobuf wheel's shared object library before loading *this* C extension,
-    # the runtime linker will prefer the protobuf module's version of symbols. This
-    # results in the process using a mixture of symbols from the protobuf wheel and
-    # this wheel, which may be using different versions of libprotobuf. In the case
-    # that they *are* using different versions of libprotobuf *and* there has been a
-    # change in data layout (or in other invariants) segfaults, data corruption, or
-    # "bad things" may happen.
+    # the runtime linker will prefer the protobuf module's version of symbols.
+    # This results in the process using a mixture of symbols from the protobuf
+    # wheel and this wheel, which may be using different versions of
+    # libprotobuf. In the case that they *are* using different versions of
+    # libprotobuf *and* there has been a change in data layout (or in other
+    # invariants) segfaults, data corruption, or "bad things" may happen.
     #
-    # This flag ensures that on Mac, the only global symbol is the one loaded by the
-    # Python interpreter. The problematic global weak symbols become local weak symbols.
-    # This is not required on Linux since the compiler does not produce global weak
-    # symbols. This is not required on Windows as our ".pyd" file does not contain any
-    # symbols.
+    # This flag ensures that on Mac, the only global symbol is the one loaded by
+    # the Python interpreter. The problematic global weak symbols become local
+    # weak symbols.  This is not required on Linux since the compiler does not
+    # produce global weak symbols. This is not required on Windows as our ".pyd"
+    # file does not contain any symbols.
     #
-    # Finally, the leading underscore here is part of the Mach-O ABI. Unlike more modern
-    # ABIs (ELF et al.), Mach-O prepends an underscore to the names of C functions.
+    # Finally, the leading underscore here is part of the Mach-O ABI. Unlike
+    # more modern ABIs (ELF et al.), Mach-O prepends an underscore to the names
+    # of C functions.
     if "darwin" in sys.platform:
         EXTRA_ENV_LINK_ARGS += ' -Wl,-exported_symbol,_{}'.format(
             _EXT_INIT_SYMBOL)