diff --git a/.github/workflows/pr-docs-preview.yml b/.github/workflows/pr-docs-preview.yml
index 783b50864..a23287a0d 100644
--- a/.github/workflows/pr-docs-preview.yml
+++ b/.github/workflows/pr-docs-preview.yml
@@ -4,6 +4,7 @@ on:
   pull_request:
     branches:
       - main
+      - '[0-9][0-9].x' # matches version branches like 18.x, 19.x, etc.
 
 permissions:
   checks: write