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diff --git a/docs/humaninterfaces.rst b/docs/humaninterfaces.rst
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--- a/docs/humaninterfaces.rst
+++ b/docs/humaninterfaces.rst
@@ -10,6 +10,7 @@ User Guides In ONAP Confluence
 
 These are links to the SDC user guides found in ONAP User Guides:
 
+* :ref:`sdc_onboarding_package_types`
 * :ref:`doc_guide_user_des_res-onb`
 * :ref:`doc_guide_user_des_vf-cre`
 * :ref:`doc_guide_user_des_ser-des`
diff --git a/docs/onboardingpackages.rst b/docs/onboardingpackages.rst
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+++ b/docs/onboardingpackages.rst
@@ -0,0 +1,130 @@
+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+.. _sdc_onboarding_package_types:
+
+========================
+Onboarding Package Types
+========================
+
+Supported Package Types
+-----------------------
+SDC supports the following packages types
+
+- Heat Package
+- ONAP Tosca CSAR Package
+- ETSI SOL004 Tosca CSAR Package
+
+Heat Package
+^^^^^^^^^^^^
+The heat package is a zip archive with a .zip extension. The package contains heat template yaml file(s), corresponding
+environment file(s) and a MANIFEST.json file. The MANIFEST.json file describes the contents of the package.
+
+There must be at least one heat template yaml file in the package whose name starts with *base_*. The other heat
+templates in the package can have any name. All  environment files that are included in the package must have the same
+name as its corresponding yaml file with a .env file extension.
+
+An example of a simple heat package stucture is a zip archive containing the following 3 files
+
+- base_vFW.yaml   (heat template)
+- base_vFW.env    (corresponding environment file)
+- MANIFEST.json   (describes files included in the package)
+
+Examples of heat packages are the packages with .zip extension available in `SDC git repo <https://git.onap.org/sdc/tree/test-apis-ci/sdc-api-tests/chef-repo/cookbooks/sdc-api-tests/files/default/Files/VNFs>`_
+
+ONAP Tosca CSAR Package
+^^^^^^^^^^^^^^^^^^^^^^^
+The ONAP Tosca CSAR package is a zip archive with a .csar extension. The structure of the CSAR package is as described
+in `ONAP wiki page <https://wiki.onap.org/display/DW/Csar+Structure>`_
+
+ETSI SOL004 Tosca CSAR Package
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+The ETSI SOL004 Tosca CSAR Package is a zip archive with a .csar extension. The structure of the supported CSAR package
+is as described in `ETSI NFV-SOL 004v2.6.1`_ csar structure option 1 i.e. CSAR containing a TOSCA-Metadata directory.
+
+The supported descriptor included in the package is aligned to `ETSI NFV-SOL 001v2.5.1 <https://docbox.etsi.org/ISG/NFV/Open/Publications_pdf/Specs-Reports/NFV-SOL%20001v2.5.1%20-%20GS%20-%20TOSCA-based%20NFV%20descriptors%20spec.pdf>`_
+
+Other Points to note when onboarding this package are:
+
+- During onboarding the ETSI NFV-SOL004 CSAR structure is transformed to the internal ONAP CSAR structure.
+- The original input CSAR is maintained and stored as the SDC artifact *ONBOARDED_PACKAGE* in the xNF internal model.
+- The non-mano artifacts are mapped to the corresponding SDC Artifact Type in the xNF internal model.
+
+Package Types applicable to Resource Types
+------------------------------------------
+VF
+^^
+The 3 package types described in `Supported Package Types`_ are all applicable for a VF i.e. a VF can be onboarded using any of
+these package types.
+
+PNF
+^^^
+Only the `ETSI SOL004 Tosca CSAR Package`_ is applicable for a PNF.
+
+.. note::
+   The PNF is not explicitly mentioned in ETSI NFV-SOL 004v2.6.1. There is a CR pending on the SOL004 specification
+   describing the PNFD archive. SDC supports and expects the metadata section in the PNFD archive manifest to be
+   aligned with this CR i.e. the entries contain the following names (keys)
+
+   - pnfd_provider
+   - pnfd_name
+   - pnfd_release_date_time
+   - pnfd_archive_version
+
+   An example of valid manifest file metadata section
+   ::
+
+      metadata:
+          pnfd_name: MRF
+          pnfd_provider: SunShineCompany
+          pnfd_archive_version: 1.0
+          pnfd_release_date_time: 2017-01-01T10:00:00+03:00
+
+When the PNF package in onboarded, the PNFD (descriptor) is transformed from ETSI NFV-SOL 001 model to the internal
+ONAP model.
+
+How does SDC determine which package type is being onboarded
+------------------------------------------------------------
+SDC onboarding processes each of the package types differently. SDC determines which package type is being onboarded, and
+hence which logic to use, based on the following
+
+First SDC checks the extension of the package. If the package extension is *.zip* then the package is treated as a `Heat package`_.
+
+If the package extension is *.csar* and the following is true
+
+- CSAR package contains TOSCA-Metadata directory
+- The TOSCA.meta file exists within the TOSCA-Metadata directory
+- The TOSCA.meta file contains the following keynames in block_0
+
+   - Entry-Definitions
+   - ETSI-Entry-Manifest
+   - ETSI-Entry-Change-Log
+
+then the package is treated as an `ETSI SOL004 Tosca CSAR Package`_. Otherwise the package is treated as an `ONAP Tosca CSAR Package`_.
+
+Package Security
+----------------
+SDC validates the authenticity and integrity of onboarding packages that are secured according to
+Security option 2 described in `ETSI NFV-SOL 004v2.6.1`_.
+
+In this option the whole package is signed and delivered as part of a zip file. SDC supports both zip file structures
+specified in the standard i.e
+
+1. Zip file containing 3 artifacts
+
+   a. Package
+   b. Signing Certificate File
+   c. Signature File
+
+2. Zip file containing 2 artifacts
+
+   a. Package
+   b. Signature File containing signing certificate
+
+SDC supports the signature in Cryptographic Message Syntax (CMS) format.
+
+.. note::
+   For SDC to validate the authenticity and integrity of the onboarding package, the root certificate of the trusted CA
+   needs to be pre-installed in SDC before onboarding is started. The details of this procedure are described :ref:`here <doc_guide_user_des_res-onb_pre-install_root_certificate>`.
+
+.. _ETSI NFV-SOL 004v2.6.1: https://docbox.etsi.org/ISG/NFV/Open/Publications_pdf/Specs-Reports/NFV-SOL%20004v2.6.1%20-%20GS%20-%20VNF%20Package%20Stage%203%20-%20spec.pdf
+\ No newline at end of file