diff --git a/python/core/keyset_reader.py b/python/core/keyset_reader.py
index ef69644652744dffb5d77e484d6b08e40a64bd25..22fab228512c58860108943938aae03d72d5fe5d 100644
--- a/python/core/keyset_reader.py
+++ b/python/core/keyset_reader.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""Reads KeySets from File."""
+"""Reads Keysets from file."""
 
 from __future__ import absolute_import
 from __future__ import division
diff --git a/python/core/keyset_writer.py b/python/core/keyset_writer.py
index aaae8844b254668e72ef896aab4ad3d4bfb3270b..def31614e3b384af02ca5d2b013f436ad5790ab6 100644
--- a/python/core/keyset_writer.py
+++ b/python/core/keyset_writer.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""Reads KeySets from File."""
+"""Writes Keysets to file."""
 
 from __future__ import absolute_import
 from __future__ import division
diff --git a/python/core/keyset_writer_test.py b/python/core/keyset_writer_test.py
index 17afc36572f8494130669b28103081de05366563..be3a3b7c17459748d41dc1f79ec3ca372b877c7a 100644
--- a/python/core/keyset_writer_test.py
+++ b/python/core/keyset_writer_test.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""Tests for tink.python.core."""
+"""Tests for tink.python.core.keyset_writer."""
 
 from __future__ import absolute_import
 from __future__ import division
diff --git a/python/core/primitive_set_test.py b/python/core/primitive_set_test.py
index 5a4953ff84c902286e423b1893dec382c02b9840..7bd81366ff26f5217b6299b641fc8834ebb3da6f 100644
--- a/python/core/primitive_set_test.py
+++ b/python/core/primitive_set_test.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""Tests for tink.python.core."""
+"""Tests for tink.python.core.primitive_set."""
 
 from __future__ import absolute_import
 from __future__ import division
diff --git a/python/core/tink_error.py b/python/core/tink_error.py
index c20581e4b15c0096b757305dc4354dcd2ce2a004..7e310aa2112f857eba04b5b804c9d2fc89321ba9 100644
--- a/python/core/tink_error.py
+++ b/python/core/tink_error.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""This module defines basic exceptions in tink."""
+"""This module defines basic exceptions in Tink."""
 
 from __future__ import absolute_import
 from __future__ import division