diff --git a/Lectures/L11_VnVPresent1/VnVPresent1.pdf b/Lectures/L11_VnVPresent1/VnVPresent1.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..b7a559b989fd3b1e1390783adbf93cec985863da
Binary files /dev/null and b/Lectures/L11_VnVPresent1/VnVPresent1.pdf differ
diff --git a/Lectures/L12_VnVPresent2/VnVPresent2.pdf b/Lectures/L12_VnVPresent2/VnVPresent2.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..f5f7709991ce0a1124edd6f2660411595642684a
Binary files /dev/null and b/Lectures/L12_VnVPresent2/VnVPresent2.pdf differ
diff --git a/Lectures/L13_ModularDesign/ModularDesign.tex b/Lectures/L13_ModularDesign/ModularDesign.tex
index d77c64c6d205887133eb2112ff00392917995a46..1a42ac7e48a5c242e1d938e4d4afb16772adac8a 100755
--- a/Lectures/L13_ModularDesign/ModularDesign.tex
+++ b/Lectures/L13_ModularDesign/ModularDesign.tex
@@ -56,6 +56,9 @@
 
 \bi
 \item GitHub issues for colleagues
+\bi
+\item When closing issues give the hash for the corresponding commit
+\ei
 \ei
 
 \end{frame}