diff --git a/src/python/docs/docstrings/PrefixColumnConcatenator.txt b/src/python/docs/docstrings/PrefixColumnConcatenator.txt
new file mode 100644
index 00000000..aac3d116
--- /dev/null
+++ b/src/python/docs/docstrings/PrefixColumnConcatenator.txt
@@ -0,0 +1,44 @@
+    """
+
+    Combines several columns into a single vector-valued column by prefix.
+
+    .. remarks::
+        ``PrefixColumnConcatenator`` creates a single vector-valued column from
+        multiple
+        columns. It can be performed on data before training a model. The
+        concatenation
+        can significantly speed up the processing of data when the number of
+        columns
+        is as large as hundreds to thousands.
+
+    :param columns: a dictionary of key-value pairs, where key is the output
+        column name and value is a list of input column names.
+
+         * Only one key-value pair is allowed.
+         * Input column type: numeric or string.
+         * Output column type:
+        `Vector Type </nimbusml/concepts/types#vectortype-column>`_.
+
+        The << operator can be used to set this value (see
+        `Column Operator </nimbusml/concepts/columns>`_)
+
+        For example
+         * ColumnConcatenator(columns={'features': ['age', 'parity',
+        'induced']})
+         * ColumnConcatenator() << {'features': ['age', 'parity',
+        'induced']})
+
+        For more details see `Columns </nimbusml/concepts/columns>`_.
+
+    .. seealso::
+        :py:class:`ColumnDropper
+        <nimbusml.preprocessing.schema.ColumnDropper>`,
+        :py:class:`ColumnSelector
+        <nimbusml.preprocessing.schema.ColumnSelector>`.
+
+    .. index:: transform, schema
+
+    Example:
+       .. literalinclude:: /../nimbusml/examples/PrefixColumnConcatenator.py
+              :language: python
+    """
diff --git a/src/python/nimbusml/internal/core/preprocessing/schema/prefixcolumnconcatenator.py b/src/python/nimbusml/internal/core/preprocessing/schema/prefixcolumnconcatenator.py
index d202e947..003e909f 100644
--- a/src/python/nimbusml/internal/core/preprocessing/schema/prefixcolumnconcatenator.py
+++ b/src/python/nimbusml/internal/core/preprocessing/schema/prefixcolumnconcatenator.py
@@ -2,6 +2,7 @@
 # Copyright (c) Microsoft Corporation. All rights reserved.
 # Licensed under the MIT License.
 # --------------------------------------------------------------------------------------------
+# - Generated by tools/entrypoint_compiler.py: do not edit by hand
 """
 PrefixColumnConcatenator
 """
@@ -15,10 +16,12 @@
 from ...base_pipeline_item import BasePipelineItem, DefaultSignature
 
 
-class PrefixColumnConcatenator(BasePipelineItem, DefaultSignature):
+class PrefixColumnConcatenator(
+        BasePipelineItem,
+        DefaultSignature):
     """
 
-    Combines several columns into a single vector-valued column by prefix
+    Combines several columns into a single vector-valued column by prefix.
 
     .. remarks::
         ``PrefixColumnConcatenator`` creates a single vector-valued column from
diff --git a/src/python/nimbusml/preprocessing/schema/prefixcolumnconcatenator.py b/src/python/nimbusml/preprocessing/schema/prefixcolumnconcatenator.py
index 9a3aa443..6e0662e1 100644
--- a/src/python/nimbusml/preprocessing/schema/prefixcolumnconcatenator.py
+++ b/src/python/nimbusml/preprocessing/schema/prefixcolumnconcatenator.py
@@ -2,6 +2,7 @@
 # Copyright (c) Microsoft Corporation. All rights reserved.
 # Licensed under the MIT License.
 # --------------------------------------------------------------------------------------------
+# - Generated by tools/entrypoint_compiler.py: do not edit by hand
 """
 PrefixColumnConcatenator
 """
@@ -17,7 +18,10 @@
 from ...internal.utils.utils import trace
 
 
-class PrefixColumnConcatenator(core, BaseTransform, TransformerMixin):
+class PrefixColumnConcatenator(
+        core,
+        BaseTransform,
+        TransformerMixin):
     """
 
     Combines several columns into a single vector-valued column by prefix.
diff --git a/src/python/tools/code_fixer.py b/src/python/tools/code_fixer.py
index 21b6d1f4..3aa233ac 100644
--- a/src/python/tools/code_fixer.py
+++ b/src/python/tools/code_fixer.py
@@ -247,12 +247,18 @@ def fix_code(class_name, filename):
         all_args['output_for_sub_graph'] = {'Model' : \
 all_args['predictor_model']}"""
 
+prefixcolumnconcatenator_1 = "output_columns = input_columns"
+prefixcolumnconcatenator_1_correct = """raise ValueError(
+                "'None' output passed when it cannot be none.")"""
+
 signature_fixes_core = {
     'NGramFeaturizer': (textTransform_1, textTransform_1_correct),
     'ColumnConcatenator': [(concatColumns_1, concatColumns_1_correct)],
     'ColumnSelector': [(columnselector_1, columnselector_1_correct)],
     'OneVsRestClassifier': [
         (onevsrestclassifier_1, onevsrestclassifier_1_correct)],
+    'PrefixColumnConcatenator': (prefixcolumnconcatenator_1,
+                                 prefixcolumnconcatenator_1_correct)
 }
 
 
diff --git a/src/python/tools/manifest_diff.json b/src/python/tools/manifest_diff.json
index 68ab2fa5..a8cd262e 100644
--- a/src/python/tools/manifest_diff.json
+++ b/src/python/tools/manifest_diff.json
@@ -785,6 +785,12 @@
       "NewName": "TypeConverter",
       "Module": "preprocessing.schema",
       "Type": "Transform"
+    },
+    {
+      "Name": "Transforms.PrefixColumnConcatenator",
+      "NewName": "PrefixColumnConcatenator",
+      "Module": "preprocessing.schema",
+      "Type": "Transform" 
     }
   ],
   "Components": [