diff --git a/action.yml b/action.yml
index beaff06..a6a42c8 100644
--- a/action.yml
+++ b/action.yml
@@ -34,8 +34,8 @@ runs:
     - ${{ inputs.token }}
     - --label-definitions-file
     - ${{ inputs.config_file_path }}
-    - ${{ inputs.command }}
     - ${{ inputs.target }}
+    - ${{ inputs.command }}
 
 branding:
   icon: 'bookmark'
diff --git a/autolabeler/labelers.py b/autolabeler/labelers.py
index 5131e7f..d301c7c 100644
--- a/autolabeler/labelers.py
+++ b/autolabeler/labelers.py
@@ -164,7 +164,8 @@ def _get_labels_for_selector_matches(
                 except Exception as ex:
                     msg = (
                         f"Failed to format match data into '{self._name}' and "
-                        f"'{self._description}'. Selector match value were: {match}")
+                        f"'{self._description}'. Selector match value were: "
+                        f"{match}: {ex}")
                     LOG.error(msg)
                     continue
 
@@ -183,9 +184,10 @@ def get_labels_for_repo(self, repo: Repository) -> list[LabelParams]:
         # If this a simple label with a static name, it always applies to the repo.
         try:
             self._name.format()
+            self._description.format()
             return [LabelParams(self._name, self._color, self._description)]
         except KeyError:
-            # Else, we must run an generate the selector:
+            # Else, we must run and generate the selectors:
             return self._get_labels_for_selector_matches(
                 self._run_selectors(repo))
 
diff --git a/autolabeler/selectors.py b/autolabeler/selectors.py
index cb7418d..7d54692 100644
--- a/autolabeler/selectors.py
+++ b/autolabeler/selectors.py
@@ -181,7 +181,7 @@ def match(self, obj: Repository|PullRequest,
         # NOTE(aznashwan): Only Repositories/PRs have associated files.
         if not isinstance(obj, (Repository, PullRequest)):
             LOG.warn(
-                f"FileSelector got unsupported object type {type(obj)}: {obj}")
+                f"{self.__class__}.match() got unsupported object type {type(obj)}: {obj}")
             return []
 
         all_files = file_cache
@@ -199,6 +199,74 @@ def match(self, obj: Repository|PullRequest,
         return res
 
 
+class LinesChangedSelector(Selector):
+
+    def __init__(
+            self, min: int|None=None, max: int|None=None,
+            change_type: str="total"):
+        if min is None and max is None:
+            raise ValueError(
+                f"{self.__class__}: at least one of min/max is required.")
+        self._min = min
+        self._max = max
+        supported_change_types = [
+            "additions", "deletions", "total", "net"]
+        if change_type not in supported_change_types:
+            raise ValueError(
+                f"Unsupported change type {change_type}. "
+                f"Must be one of: {supported_change_types}")
+        self._change_type = change_type
+
+    @classmethod
+    def from_dict(cls, val: dict):
+        supported_keys = ["min",  "max", "type"]
+        unsupported_keys = [k for k in val if k not in supported_keys]
+        if unsupported_keys:
+            raise ValueError(
+                f"{cls}.from_dict() got unsupported keys: {unsupported_keys}")
+        return cls(
+            min=val.get("min"), max=val.get("max"),
+            change_type=val.get("type", "total"))
+
+    def match(self, obj: Repository|PullRequest,
+              file_cache: list[str]=[]) -> list[dict]:
+        _ = file_cache
+
+        # NOTE(aznashwan): Only Repositories/PRs have associated files.
+        if not isinstance(obj, (PullRequest, Repository)):
+            LOG.warn(
+                f"{self.__class__}.match() got unsupported object type {type(obj)}: {obj}")
+            return []
+
+        res = {
+            "lines-changed-min":
+                self._min if self._min is not None else "-Inf",
+            "lines-changed-max":
+                self._max if self._max is not None else "+Inf"}
+        if isinstance(obj, Repository):
+            return [res]
+
+        changes = 0
+        match self._change_type:
+            case "total":
+                changes = obj.additions + obj.deletions
+            case "additions":
+                changes = obj.additions
+            case "deletions":
+                changes = obj.deletions
+            case "net":
+                changes = obj.additions - obj.deletions
+            case other:
+                raise ValueError(
+                    f"Got unsupported change totalling scheme: {other}")
+
+        if self._min is not None and changes < self._min:
+            return []
+        if self._max is not None and changes >= self._max:
+            return []
+        return [res]
+
+
 class FileLister():
 
     def __init__(self, obj: Repository|PullRequest):
@@ -231,6 +299,7 @@ def list_file_paths(self) -> list[str]:
 SELECTORS_NAME_MAP = {
     "regex": RegexSelector,
     "files": FilesSelector,
+    "lines-changed": LinesChangedSelector,
 }
 
 
diff --git a/autolabels.yml b/autolabels.yml
index 49cdb39..d2ec83a 100644
--- a/autolabels.yml
+++ b/autolabels.yml
@@ -70,7 +70,8 @@ pr-size-measure:
       This PR is between {lines-changed-min} and {lines-changed-max} lines of code.
     selectors:
       lines-changed:
-        min: 0
+        type: net # Can be: additions/deletions/total/net (net = additions - deletions)
+        min: 1
         max: 1000
 
   large:
@@ -80,5 +81,21 @@ pr-size-measure:
     selectors:
       lines-changed:
         min: 1000
-        # NOTE: setting max to zero will remove any upper bound.
-        max: 0
+        max: 10000
+
+  too-big:
+    label-color: d73a4a
+    label-description: |
+      This PR has more than {lines-changed-min} lines and must be broken down into smaller PRs.
+    selectors:
+      lines-changed:
+        # NOTE: omitting 'max/min' will set the bounds to +/- Infinity respectively.
+        min: 10000
+    action:
+      close:
+        # Will only trigger for PRs larger than 10k lines.
+        on: "{lines-changed-min}"
+        with-comment: |
+          Thank you for your contribution, but this PR is too large to be reviewed effectively.
+          Please break down the changes into individual PRs no larger than {lines-changed-min} lines.
+
diff --git a/samples/101-showcase.yml b/samples/101-showcase.yml
index eddb11d..c96a671 100644
--- a/samples/101-showcase.yml
+++ b/samples/101-showcase.yml
@@ -1,11 +1,10 @@
-# This defines a static label named 'example-label' with the given props.
+# This defines a static static label named 'example-label' with the given props.
 example-label:
-  # NOTE: 'label-color' and 'label-description' are always required.
   label-color: 0075ca  # blue
   label-description: This is a simple example static label.
 
 
-# This defines two "namespaced" static labels named: label-prefix/sublabel-{1,2}.
+# This defines two "namespaced" labels named: label-prefix/sublabel-{1,2}.
 label-prefix:
   sublabel-1:
     label-color: 0075ca
@@ -15,7 +14,7 @@ label-prefix:
     label-description: This is a simple second sublabel.
 
 
-# This will define as many labels as there are file matches in the repo.
+# This will define as many labels as there are filepath regex matches.
 label-for-sample-file-{files-name-regex-group-1}:
   label-color: 0075ca
   # NOTE: "group-0" is the entire filepath.
@@ -53,12 +52,9 @@ bug:
       maintainer-comments-only: false
 
 
-# This will allow project maintainers to automatically generate and
-# set labels on Issues/PRs by commenting '/label-me-as $LABEL':
 manual-{regex-comments-group-2}:
   label-color: d73a4a
-  label-description: |
-    "This label was defined through a maintainer comment with: {regex-comments-group-1}"
+  label-description: "This label was defined through a maintainer comment with: {regex-comments-group-1}"
   selectors:
     regex:
       maintainer-comments-only: true
@@ -74,7 +70,8 @@ pr-size-measure:
       This PR is between {lines-changed-min} and {lines-changed-max} lines of code.
     selectors:
       lines-changed:
-        min: 0
+        type: net # Can be: additions/deletions/total/net (net = additions - deletions)
+        min: 1
         max: 1000
 
   large:
@@ -85,4 +82,19 @@ pr-size-measure:
       lines-changed:
         min: 1000
         # NOTE: setting max to zero will remove any upper bound.
-        max: 0
+        max: 10000
+
+  too-big:
+    label-color: d73a4a
+    label-description: |
+      This PR has more than {lines-changed-min} lines and must be broken down into smaller PRs.
+    action:
+      close:
+        # Will only trigger for PRs larger than 10k lines.
+        on: "{lines-changed-min}"
+        with-comment: |
+          Thank you for your contribution, but this PR is too large to be reviewed efficiently.
+          Please break down the changes into individual PRs no larger than {lines-changed-min} lines.
+    selectors:
+      lines-changed:
+        min: 10000