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   <h1>Interaction Design - Course Page</h1>
   <h2>Lectures</h2>
   <link rel="stylesheet" href="css/theme.css">
-  <a href="lectures/InteractionDesign_RPi_intro.pptx">Slideset 1 - Interaction Design - Intro</a>
+  <a href="lectures/InteractionDesign_RPi_intro.pptx">Slideset 1 - Interaction Design - Intro (PPTX)</a>
   <br>
+  
+  <a href="lectures/InteractionDesign_RPi_intro.pdf">Slideset 1 - Interaction Design - Intro (PDF)</a>
+  
+  <br>
+  <br>
+  <a href="lectures/InteractionDesign_RPi_Lab.pptx">Slideset 2 - Interaction Design - Lab (PPTX)</a>
   <br>
-  <a href="lectures/InteractionDesign_RPi_Lab.pptx">Slideset 2 - Interaction Design - Lab</a>
+  <a href="lectures/InteractionDesign_RPi_Lab.pdf">Slideset 2 - Interaction Design - Lab (PDF)</a>
 
   <h2>Gitlab</h2>
   <a href="https://gitlab.liu.se/interaction_design/IxD_libs" target="_blank">GrovePi+ additional lib</a>
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