diff --git a/README.md b/README.md
index 84becf0f..673dbc36 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,7 @@
     * [Supported filters](#supported-filters)
     * [Examples for filters](#examples-for-filters)
     * [Built-in filters](#built-in-filters)
+    * [Supported variants](#supported-variants)
     * [Changing the 3D model, simple mechanism](#changing-the-3d-model-simple-mechanism)
     * [Changing the 3D model, complex mechanism](#changing-the-3d-model-complex-mechanism)
     * [DNF and DNC internal keys](#dnf-and-dnc-internal-keys)
@@ -942,6 +943,82 @@ The [tests/yaml_samples](https://github.com/INTI-CMNB/KiBot/tree/master/tests/ya
 
 Note that the **_kibom_...** filters uses a field named `Config`, but you can customise them invoking **_kibom_dnf_FIELD**. This will create an equivalent filter, but using the indicated **FIELD**.
 
+
+#### Supported variants:
+
+- `ibom`: IBoM variant style
+        The Config field (configurable) contains a value.
+        If this value matches with a value in the whitelist is included.
+        If this value matches with a value in the blacklist is excluded.
+  * Valid keys:
+    - `comment`: [string=''] A comment for documentation purposes.
+    - `dnc_filter`: [string|list(string)=''] Name of the filter to mark components as 'Do Not Change'.
+                    Use '_kibom_dnc' for the default KiBoM behavior.
+    - `dnf_filter`: [string|list(string)=''] Name of the filter to mark components as 'Do Not Fit'.
+                    Use '_kibom_dnf' for the default KiBoM behavior.
+                    Use '_kicost_dnp'' for the default KiCost behavior.
+    - `exclude_filter`: [string|list(string)=''] Name of the filter to exclude components from BoM processing.
+                        Use '_mechanical' for the default KiBoM behavior.
+    - `file_id`: [string=''] Text to use as the replacement for %v expansion.
+    - `name`: [string=''] Used to identify this particular variant definition.
+    - `pre_transform`: [string|list(string)=''] Name of the filter to transform fields before applying other filters.
+                       Use '_var_rename' to transform VARIANT:FIELD fields.
+                       Use '_var_rename_kicost' to transform kicost.VARIANT:FIELD fields.
+                       Use '_kicost_rename' to apply KiCost field rename rules.
+    - `variant_field`: [string='Config'] Name of the field that stores board variant for component.
+    - `variants_blacklist`: [string|list(string)=''] List of board variants to exclude from the BOM.
+    - `variants_whitelist`: [string|list(string)=''] List of board variants to include in the BOM.
+- `kibom`: KiBoM variant style
+        The Config field (configurable) contains a comma separated list of variant directives.
+        -VARIANT excludes a component from VARIANT.
+        +VARIANT includes the component only if we are using this variant.
+  * Valid keys:
+    - `comment`: [string=''] A comment for documentation purposes.
+    - `config_field`: [string='Config'] Name of the field used to classify components.
+    - `dnc_filter`: [string|list(string)=''] Name of the filter to mark components as 'Do Not Change'.
+                    Use '_kibom_dnc' for the default KiBoM behavior.
+    - `dnf_filter`: [string|list(string)=''] Name of the filter to mark components as 'Do Not Fit'.
+                    Use '_kibom_dnf' for the default KiBoM behavior.
+                    Use '_kicost_dnp'' for the default KiCost behavior.
+    - `exclude_filter`: [string|list(string)=''] Name of the filter to exclude components from BoM processing.
+                        Use '_mechanical' for the default KiBoM behavior.
+    - `file_id`: [string=''] Text to use as the replacement for %v expansion.
+    - `name`: [string=''] Used to identify this particular variant definition.
+    - `pre_transform`: [string|list(string)=''] Name of the filter to transform fields before applying other filters.
+                       Use '_var_rename' to transform VARIANT:FIELD fields.
+                       Use '_var_rename_kicost' to transform kicost.VARIANT:FIELD fields.
+                       Use '_kicost_rename' to apply KiCost field rename rules.
+    - `variant`: [string|list(string)=''] Board variant(s).
+- `kicost`: KiCost variant style
+        The `variant` field (configurable) contains one or more values.
+        If any of these values matches the variant regex the component is included.
+        By default a pre-transform filter is applied to support kicost.VARIANT:FIELD and
+        field name aliases used by KiCost.
+        Also a default `dnf_filter` implements the KiCost DNP mechanism.
+  * Valid keys:
+    - `comment`: [string=''] A comment for documentation purposes.
+    - `dnc_filter`: [string|list(string)=''] Name of the filter to mark components as 'Do Not Change'.
+                    Use '_kibom_dnc' for the default KiBoM behavior.
+    - `dnf_filter`: [string|list(string)=''] Name of the filter to mark components as 'Do Not Fit'.
+                    Use '_kibom_dnf' for the default KiBoM behavior.
+                    Use '_kicost_dnp'' for the default KiCost behavior.
+    - `exclude_filter`: [string|list(string)=''] Name of the filter to exclude components from BoM processing.
+                        Use '_mechanical' for the default KiBoM behavior.
+    - `file_id`: [string=''] Text to use as the replacement for %v expansion.
+    - `name`: [string=''] Used to identify this particular variant definition.
+    - `pre_transform`: [string|list(string)=''] Name of the filter to transform fields before applying other filters.
+                       Use '_var_rename' to transform VARIANT:FIELD fields.
+                       Use '_var_rename_kicost' to transform kicost.VARIANT:FIELD fields.
+                       Use '_kicost_rename' to apply KiCost field rename rules.
+    - `separators`: [string=',;/ '] Valid separators for variants in the variant field.
+                    Each character is a valid separator.
+                    Only supported internally, don't use it if you plan to use KiCost.
+    - `variant`: [string=''] Variants to match (regex).
+    - `variant_field`: [string='variant'] Name of the field that stores board variant/s for component.
+                       Only supported internally, don't use it if you plan to use KiCost.
+
+
+
 #### Changing the 3D model, simple mechanism
 
 This mechanism allows small changes to the 3D model. Is simple to use, but the information is located in the schematic.
@@ -3576,6 +3653,7 @@ Usage:
   kibot [-v...] --help-output=HELP_OUTPUT
   kibot [-v...] --help-outputs
   kibot [-v...] --help-preflights
+  kibot [-v...] --help-variants
   kibot -h | --help
   kibot --version
 
@@ -3619,6 +3697,7 @@ Help options:
   --help-output HELP_OUTPUT        Help for this particular output
   --help-outputs                   List supported outputs and details
   --help-preflights                List supported preflights and details
+  --help-variants                  List supported variants and details
 
 ```
 
diff --git a/docs/README.in b/docs/README.in
index 9529fcf0..41a3e049 100644
--- a/docs/README.in
+++ b/docs/README.in
@@ -49,6 +49,7 @@
     * [Supported filters](#supported-filters)
     * [Examples for filters](#examples-for-filters)
     * [Built-in filters](#built-in-filters)
+    * [Supported variants](#supported-variants)
     * [Changing the 3D model, simple mechanism](#changing-the-3d-model-simple-mechanism)
     * [Changing the 3D model, complex mechanism](#changing-the-3d-model-complex-mechanism)
     * [DNF and DNC internal keys](#dnf-and-dnc-internal-keys)
@@ -549,6 +550,10 @@ The [tests/yaml_samples](https://github.com/INTI-CMNB/KiBot/tree/master/tests/ya
 
 Note that the **_kibom_...** filters uses a field named `Config`, but you can customise them invoking **_kibom_dnf_FIELD**. This will create an equivalent filter, but using the indicated **FIELD**.
 
+
+#### @variants@
+
+
 #### Changing the 3D model, simple mechanism
 
 This mechanism allows small changes to the 3D model. Is simple to use, but the information is located in the schematic.
diff --git a/docs/replace_tags.pl b/docs/replace_tags.pl
index 990d0c5d..8b2c7748 100644
--- a/docs/replace_tags.pl
+++ b/docs/replace_tags.pl
@@ -4,6 +4,7 @@ $outputs =`../src/kibot --help-outputs`;
 $cmd_help=`../src/kibot --help`;
 $preflight=`../src/kibot --help-preflights`;
 $filters=`../src/kibot --help-filters`;
+$variants=`../src/kibot --help-variants`;
 $global_options=`../src/kibot --help-global-options`;
 $dependencies=`../src/kibot --help-dependencies --markdown`;
 $json_dep=`../src/kibot --help-dependencies --json`;
@@ -15,6 +16,7 @@ while (<>)
    $_ =~ s/\@cmd_help\@/$cmd_help/;
    $_ =~ s/\@preflight\@/$preflight/;
    $_ =~ s/\@filters\@/$filters/;
+   $_ =~ s/\@variants\@/$variants/;
    $_ =~ s/\@global_options\@/$global_options/;
    $_ =~ s/\@dependencies\@/$dependencies/;
    $_ =~ s/\@json_dep\@/$json_dep/;
diff --git a/kibot/__main__.py b/kibot/__main__.py
index c2334b06..599f8456 100644
--- a/kibot/__main__.py
+++ b/kibot/__main__.py
@@ -22,6 +22,7 @@ Usage:
   kibot [-v...] --help-output=HELP_OUTPUT
   kibot [-v...] --help-outputs
   kibot [-v...] --help-preflights
+  kibot [-v...] --help-variants
   kibot -h | --help
   kibot --version
 
@@ -65,6 +66,7 @@ Help options:
   --help-output HELP_OUTPUT        Help for this particular output
   --help-outputs                   List supported outputs and details
   --help-preflights                List supported preflights and details
+  --help-variants                  List supported variants and details
 
 """
 import os
@@ -99,7 +101,7 @@ from .misc import EXIT_BAD_ARGS, W_VARCFG, NO_PCBNEW_MODULE, W_NOKIVER, hide_std
 from .pre_base import BasePreFlight
 from .error import KiPlotConfigurationError, config_error
 from .config_reader import (CfgYamlReader, print_outputs_help, print_output_help, print_preflights_help, create_example,
-                            print_filters_help, print_global_options_help, print_dependencies)
+                            print_filters_help, print_global_options_help, print_dependencies, print_variants_help)
 from .kiplot import (generate_outputs, load_actions, config_output, generate_makefile, generate_examples, solve_schematic,
                      solve_board_file, solve_project_file, check_board_file)
 GS.kibot_version = __version__
@@ -298,6 +300,9 @@ def main():
     if args.help_preflights:
         print_preflights_help()
         sys.exit(0)
+    if args.help_variants:
+        print_variants_help()
+        sys.exit(0)
     if args.help_filters:
         print_filters_help()
         sys.exit(0)
diff --git a/kibot/config_reader.py b/kibot/config_reader.py
index 1b390ad2..4c012205 100644
--- a/kibot/config_reader.py
+++ b/kibot/config_reader.py
@@ -21,6 +21,7 @@ from .misc import (NO_YAML_MODULE, EXIT_BAD_ARGS, EXAMPLE_CFG, WONT_OVERWRITE, W
 from .gs import GS
 from .registrable import RegOutput, RegVariant, RegFilter, RegDependency
 from .pre_base import BasePreFlight
+from .var_base import BaseVariant
 from . import __pypi_deps__
 # Logger
 from . import log
@@ -656,6 +657,18 @@ def print_preflights_help():
             print_output_options(n, options, 2)
 
 
+def print_variants_help():
+    vars = BaseVariant.get_registered()
+    logger.debug('{} supported variants'.format(len(vars)))
+    print('Supported variants:\n')
+    for n, o in OrderedDict(sorted(vars.items())).items():
+        help = o.__doc__
+        if help is None:
+            help = 'Undocumented'
+        print('- `{}`: {}.'.format(n, help.strip()))
+        print_output_options(n, o, 2)
+
+
 def print_filters_help():
     filters = RegFilter.get_registered()
     logger.debug('{} supported filters'.format(len(filters)))
diff --git a/kibot/kicad/v5_sch.py b/kibot/kicad/v5_sch.py
index a5db953f..5e43ba61 100644
--- a/kibot/kicad/v5_sch.py
+++ b/kibot/kicad/v5_sch.py
@@ -882,6 +882,7 @@ class SchematicComponent(object):
         self.field_ref = ''
         self.value = ''
         self.footprint = ''
+        self.footprint_lib = None
         self.datasheet = ''
         self.desc = ''
         self.fields = []
diff --git a/kibot/var_ibom.py b/kibot/var_ibom.py
index 39fb3856..e9396aee 100644
--- a/kibot/var_ibom.py
+++ b/kibot/var_ibom.py
@@ -19,7 +19,7 @@ class IBoM(BaseVariant):  # noqa: F821
     """ IBoM variant style
         The Config field (configurable) contains a value.
         If this value matches with a value in the whitelist is included.
-        If this value matches with a value in the blacklist is excluded. """
+        If this value matches with a value in the blacklist is excluded """
     def __init__(self):
         super().__init__()
         with document:
diff --git a/kibot/var_kibom.py b/kibot/var_kibom.py
index c5d78f14..4e707d26 100644
--- a/kibot/var_kibom.py
+++ b/kibot/var_kibom.py
@@ -19,7 +19,7 @@ class KiBoM(BaseVariant):  # noqa: F821
     """ KiBoM variant style
         The Config field (configurable) contains a comma separated list of variant directives.
         -VARIANT excludes a component from VARIANT.
-        +VARIANT includes the component only if we are using this variant. """
+        +VARIANT includes the component only if we are using this variant """
     def __init__(self):
         super().__init__()
         self._def_exclude_filter = None