diff --git a/pandas/io/formats/csvs.py b/pandas/io/formats/csvs.py
index 3c236fa10a5d6..6fabd2573a7b4 100644
--- a/pandas/io/formats/csvs.py
+++ b/pandas/io/formats/csvs.py
@@ -134,7 +134,7 @@ def save(self):
         """
         Create the writer & save
         """
-        # GH 21227 internal compression is not used when file-like passed.
+        # GH21227 internal compression is not used when file-like passed.
         if self.compression and hasattr(self.path_or_buf, 'write'):
             msg = ("compression has no effect when passing file-like "
                    "object as input.")
@@ -148,7 +148,7 @@ def save(self):
         if is_zip:
             # zipfile doesn't support writing string to archive. uses string
             # buffer to receive csv writing and dump into zip compression
-            # file handle. GH 21241, 21118
+            # file handle. GH21241, GH21118
             f = StringIO()
             close = False
         elif hasattr(self.path_or_buf, 'write'):
@@ -176,7 +176,7 @@ def save(self):
 
         finally:
             if is_zip:
-                # GH 17778 handles zip compression separately.
+                # GH17778 handles zip compression separately.
                 buf = f.getvalue()
                 if hasattr(self.path_or_buf, 'write'):
                     self.path_or_buf.write(buf)
diff --git a/pandas/tests/io/test_compression.py b/pandas/tests/io/test_compression.py
index a3639b3e236df..76788ced44e84 100644
--- a/pandas/tests/io/test_compression.py
+++ b/pandas/tests/io/test_compression.py
@@ -53,8 +53,7 @@ def test_compression_size_fh(obj, method, compression_only):
 ])
 def test_dataframe_compression_defaults_to_infer(
         write_method, write_kwargs, read_method, compression_only):
-    # Test that DataFrame.to_* methods default to inferring compression from
-    # paths. GH 22004
+    # GH22004
     input = pd.DataFrame([[1.0, 0, -4], [3.4, 5, 2]], columns=['X', 'Y', 'Z'])
     extension = icom._compression_to_extension[compression_only]
     with tm.ensure_clean('compressed' + extension) as path:
@@ -72,8 +71,7 @@ def test_dataframe_compression_defaults_to_infer(
 def test_series_compression_defaults_to_infer(
         write_method, write_kwargs, read_method, read_kwargs,
         compression_only):
-    # Test that Series.to_* methods default to inferring compression from
-    # paths. GH 22004
+    # GH22004
     input = pd.Series([0, 5, -2, 10], name='X')
     extension = icom._compression_to_extension[compression_only]
     with tm.ensure_clean('compressed' + extension) as path:
@@ -84,7 +82,7 @@ def test_series_compression_defaults_to_infer(
 
 def test_compression_warning(compression_only):
     # Assert that passing a file object to to_csv while explicitly specifying a
-    # compression protocol triggers a RuntimeWarning, as per GH 21227.
+    # compression protocol triggers a RuntimeWarning, as per GH21227.
     # Note that pytest has an issue that causes assert_produces_warning to fail
     # in Python 2 if the warning has occurred in previous tests
     # (see https://git.io/fNEBm & https://git.io/fNEBC). Hence, should this