diff --git a/.github/workflows/pdoc.yml b/.github/workflows/pdoc.yml
index 7cf1e1a3..1645adde 100644
--- a/.github/workflows/pdoc.yml
+++ b/.github/workflows/pdoc.yml
@@ -2,8 +2,9 @@ name: Pdoc
 
 on:
   push:
-      tags:
-        - v*.*.*
+    tags:
+      - v*.*.*
+  workflow_dispatch:
 
 jobs:
   build:
@@ -35,7 +36,7 @@ jobs:
       - name: Run sed  # Removes insanely-long parameter definition from docs
         working-directory: ./api_documentation
         run: |
-          sed -i '' -E 's#(AhocorasickTokenizer\().*(markup_text:)#\1),<br>\2#g' eyecite/find.html eyecite/index.html
+          sed -i -E 's#(AhocorasickTokenizer\().*(markup_text:)#\1),<br>\2#g' eyecite/find.html eyecite/index.html
 
       - name: Deploy 🚀
         uses: JamesIves/github-pages-deploy-action@v4
diff --git a/CHANGES.md b/CHANGES.md
index 0b6fcb17..e23d505a 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -13,6 +13,8 @@ Changes:
 - CI: benchmark runs are superseded when a PR is updated, time out after 15 minutes, and pin their third-party action to a commit SHA. #332
 
 Fixes:
+- CI: fix `sed` invocation syntax in the Pdoc workflow on GNU/Linux runners and
+  add `workflow_dispatch` trigger. #316
 - CI: harden the benchmark's `repository_dispatch` job against shell script
   injection by passing `client_payload` values through the environment and
   validating their shape, instead of interpolating them into `run:`. #337