diff --git a/.github/bump-callers/README.md b/.github/bump-callers/README.md
index f37b549..b93488d 100644
--- a/.github/bump-callers/README.md
+++ b/.github/bump-callers/README.md
@@ -25,7 +25,7 @@ forward automatically instead of silently drifting commits behind.
 |---|---|---|---|
 | [`bump-cursor-review-callers.yml`](../workflows/bump-cursor-review-callers.yml) | `cursor-review.yml` | `CURSOR_REVIEW_CALLERS` | non-empty (hard-fails if empty) |
 | [`bump-agents-md-callers.yml`](../workflows/bump-agents-md-callers.yml) | `agents-md-integrity.yml` or `agents-md-integrity/**` | `AGENTS_MD_CALLERS` | empty `[]` (grows as callers land) |
-| [`bump-pr-size-callers.yml`](../workflows/bump-pr-size-callers.yml) | `pr-size.yml` | `PR_SIZE_CALLERS` | empty `[]` (grows as callers land) |
+| [`bump-pr-size-callers.yml`](../workflows/bump-pr-size-callers.yml) | `pr-size.yml` or `scripts/check-pr-size/**` | `PR_SIZE_CALLERS` | empty `[]` (grows as callers land) |
 
 They stay as thin entrypoints rather than one matrix because their triggers
 differ: a `cursor-review.yml` change must not spuriously bump agents-md or
diff --git a/.github/workflows/bump-agents-md-callers.yml b/.github/workflows/bump-agents-md-callers.yml
index 4f58dc1..03106f3 100644
--- a/.github/workflows/bump-agents-md-callers.yml
+++ b/.github/workflows/bump-agents-md-callers.yml
@@ -5,11 +5,12 @@ name: Bump agents-md-integrity callers
 # it. PRs are opened by Cloud Code Bot so they are easy to filter and merge.
 #
 # This is a thin entrypoint over the shared bumper at
-# .github/bump-callers/bump-callers.sh — the same script drives the cursor-review
-# caller fleet (bump-cursor-review-callers.yml). Keeping ONE implementation is
-# deliberate: a forked copy is how other shared machinery in the org has drifted.
-# The two entrypoints differ only in their path-filter trigger and the three
-# parameters passed below. (They stay separate rather than a single matrix
+# .github/bump-callers/bump-callers.sh — the same script drives the
+# cursor-review and pr-size caller fleets (bump-cursor-review-callers.yml,
+# bump-pr-size-callers.yml). Keeping ONE implementation is deliberate: a forked
+# copy is how other shared machinery in the org has drifted. The entrypoints
+# differ only in their path-filter trigger and the three parameters passed
+# below. (They stay separate rather than a single matrix
 # because their triggers differ — a cursor-review.yml change must not spuriously
 # bump agents-md callers, and vice versa.)
 #
diff --git a/.github/workflows/bump-cursor-review-callers.yml b/.github/workflows/bump-cursor-review-callers.yml
index bf685f7..395fb92 100644
--- a/.github/workflows/bump-cursor-review-callers.yml
+++ b/.github/workflows/bump-cursor-review-callers.yml
@@ -6,10 +6,11 @@ name: Bump cursor-review callers
 #
 # This is a thin entrypoint over the shared bumper at
 # .github/bump-callers/bump-callers.sh — the same script drives the
-# agents-md-integrity caller fleet (bump-agents-md-callers.yml). Keeping ONE
-# implementation is deliberate: a forked copy is how other shared machinery in
-# the org has drifted. The two entrypoints differ only in their path-filter
-# trigger and the three parameters passed below.
+# agents-md-integrity and pr-size caller fleets (bump-agents-md-callers.yml,
+# bump-pr-size-callers.yml). Keeping ONE implementation is deliberate: a forked
+# copy is how other shared machinery in the org has drifted. The entrypoints
+# differ only in their path-filter trigger and the three parameters passed
+# below.
 #
 # The caller list is NOT hardcoded here. This repo is PUBLIC (workflow file and
 # Actions run logs are both publicly viewable), and most callers are private, so
diff --git a/.github/workflows/bump-pr-size-callers.yml b/.github/workflows/bump-pr-size-callers.yml
index 2234dae..146a775 100644
--- a/.github/workflows/bump-pr-size-callers.yml
+++ b/.github/workflows/bump-pr-size-callers.yml
@@ -38,6 +38,11 @@ on:
     branches: [main]
     paths:
       - .github/workflows/pr-size.yml
+      # The counting logic consumers actually run lives here, built from the
+      # `workflows_ref` SHA a caller pins (see pr-size.yml's header) — a
+      # behavior change here needs the same caller bump as a workflow-file
+      # change, or pinned callers silently drift onto stale tool behavior.
+      - scripts/check-pr-size/**
 
 permissions:
   contents: read