diff --git a/.github/workflows/build-release-zip-file.yml b/.github/workflows/build-release-zip-file.yml
index 15c8fcf..a755217 100644
--- a/.github/workflows/build-release-zip-file.yml
+++ b/.github/workflows/build-release-zip-file.yml
@@ -1,9 +1,13 @@
 name: Build release zip
 
 on:
+  ## Build and upload zip on new release.
   release:
     types: [published]
 
+  ## Build zip on demand.
+  workflow_dispatch:
+
 jobs:
   build:
     name: Generate zip and upload it to GitHub release
@@ -42,6 +46,7 @@ jobs:
         SVN_PASSWORD: ${{ secrets.SVN_PASSWORD }}
 
     - name: Upload release asset
+      if: github.event_name == 'release' ## Don't upload zip if no release is created.
       uses: actions/upload-release-asset@v1
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}