diff --git a/action.yml b/action.yml
index 3f2e170..0a14979 100644
--- a/action.yml
+++ b/action.yml
@@ -65,6 +65,7 @@ runs:
       id: date
     - run: >
         pandoc
+        --pdf-engine=lualatex
         --embed-resources
         --standalone
         --template=eisvogel.latex
@@ -95,6 +96,7 @@ runs:
         MERMAID_FILTER_FORMAT: "pdf"
     - run: >
         pandoc
+        --pdf-engine=lualatex
         --embed-resources
         --standalone
         --template=eisvogel.latex
@@ -126,6 +128,7 @@ runs:
         MERMAID_FILTER_FORMAT: "pdf"
     - run: >
         pandoc
+        --pdf-engine=lualatex
         --embed-resources
         --standalone
         --filter=/resources/filters/info.py
diff --git a/sample3.md b/sample3.md
index 73d29de..06a2a61 100644
--- a/sample3.md
+++ b/sample3.md
@@ -178,14 +178,19 @@ This section contains an HTML Table.
 </thead>
 <tbody>
 <tr>
-<td>CEIL(x)</td>
+<td>⌈x⌉</td>
 <td>the smallest integer not less than x</td>
 </tr>
 <tr>
-<td><strong>FLOOR(</strong>x<strong>)</strong></td>
+<td>⌊x⌋</td>
 <td>the largest integer not greater than x</td>
 </tr>
 <tr>
+<td>A ≔ B</td>
+<td>assignment of the results of the expression on the right (B) to the
+parameter on the left</td>
+</tr>
+<tr>
 <td>A = B</td>
 <td>equivalence (A is the same as B)</td>
 </tr>