Documentation updated to bb960e8
diff --git a/hop-user-manual/modules/ROOT/pages/pipeline/transforms/mapping-input.adoc b/hop-user-manual/modules/ROOT/pages/pipeline/transforms/mapping-input.adoc
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+////
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership. The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at
+ http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied. See the License for the
+specific language governing permissions and limitations
+under the License.
+////
+:documentationPath: /pipeline/transforms/
+:language: en_US
+:page-alternativeEditUrl: https://github.com/apache/incubator-hop/edit/master/plugins/transforms/mapping/src/main/doc/mapping-input.adoc
+= Mapping Input
+
+== Description
+
+This transform is not just a place-holder in a Mapping pipeline (referred to as a Mapping), it represents and describes its input. The data of this input will be provided for by the parent pipeline calling the mapping.
+
+== Options
+
+The fields described in this transform are those that you want to refer to in this pipeline. When you use the mapping you can map input to these field names to arrive at a re-usable part of a pipeline.
diff --git a/hop-user-manual/modules/ROOT/pages/pipeline/transforms/mapping-output.adoc b/hop-user-manual/modules/ROOT/pages/pipeline/transforms/mapping-output.adoc
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+////
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership. The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at
+ http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied. See the License for the
+specific language governing permissions and limitations
+under the License.
+////
+:documentationPath: /pipeline/transforms/
+:language: en_US
+:page-alternativeEditUrl: https://github.com/apache/incubator-hop/edit/master/plugins/transforms/mapping/src/main/doc/mapping-output.adoc
+= Mapping Output
+
+== Description
+
+This transform serves as a way to tell the parent pipeline that data can be retrieved in this specific location.
+In other words, it represents and describes the output of the mapping pipeline. The data entering this transform will be streamed to the parent pipeline calling the mapping.
diff --git a/hop-user-manual/modules/ROOT/pages/pipeline/transforms/simple-mapping.adoc b/hop-user-manual/modules/ROOT/pages/pipeline/transforms/simple-mapping.adoc
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+////
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership. The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at
+ http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied. See the License for the
+specific language governing permissions and limitations
+under the License.
+////
+:documentationPath: /pipeline/transforms/
+:language: en_US
+:page-alternativeEditUrl: https://github.com/apache/incubator-hop/edit/master/plugins/transforms/mapping/src/main/doc/simple-mapping.adoc
+= = Simple Mapping
+
+== Description
+
+A Mapping transform allows you to re-use a series of transforms in the form of a "re-usable pipeline" also known as a "Mapping". In the "Simple Mapping" transform you can specify one xref:mapping-input.adoc[Mapping Input] transform to pass data to and one xref:mapping-output.adoc[Mapping Output] transform to retrieve rows of data from.
+
+== Options
+
+The options are fairly self-explanatory:
+
+* Transform name: a unique name in your pipeline
+* Pipeline: The name of the mapping (sub-) pipeline to embed. This pipeline is executed separately and is considered a separate entity. It is always executed with a standard local Hop pipeline run configuration since that is currently the only one capable of streaming data into and out of transforms.
+* Parameters tab: specify the parameters you want to pass to the mapping pipeline
+* Input tab: specify which fields to pass to the xref:mapping-input.adoc[Mapping Input] transform in the mapping. You can map (hence the name) field names.
+* Output tab: specify how to rename output fields retrieved from the xref:mapping-output.adoc[Mapping Output] transform.
+
+== Sample
+
+In the samples project you can find a small example of the Simple Mapping transform called `mapping-use.hpl'.
+
