diff --git a/talk/expert/cpp20spaceship.tex b/talk/expert/cpp20spaceship.tex
index 7a3770e5..3747b3f0 100644
--- a/talk/expert/cpp20spaceship.tex
+++ b/talk/expert/cpp20spaceship.tex
@@ -74,7 +74,10 @@
   \end{block}
   \begin{exampleblock}{3 types of ordering}
     \begin{description}[partial]
-    \item[strong] exactly one test among \cppinline{<0}, \cppinline{==0}, and \cppinline{>0} will return \cppinline{true}
+    \item[strong] exactly one test among \cppinline{<0}, \cppinline{==0}, and \cppinline{>0} will return \cppinline{true};
+          \begin{itemize}
+            \item equivalent values are indistinguishable, i.e.\ all members that take part in the comparison are equal
+          \end{itemize}
     \item[weak] like strong but two \emph{equivalent} values may differ
       \begin{itemize}
       \item they are however \emph{equivalent} for ranking
diff --git a/talk/expert/perfectforwarding.tex b/talk/expert/perfectforwarding.tex
index 3cf1db3d..f290658f 100644
--- a/talk/expert/perfectforwarding.tex
+++ b/talk/expert/perfectforwarding.tex
@@ -274,7 +274,7 @@
 
 \begin{frame}[fragile]
   \frametitlecpp[11]{Perfect forwarding}
-    \begin{exampleblock}{Example - putting it all together}
+    \begin{exampleblock}{Example - putting it all together \hfill \cppinsightLink{https://cppinsights.io/s/21f8fe90}}
     \begin{cppcode}
       template <typename... T>
       void wrapper(T&&... args) {
diff --git a/talk/expert/variadictemplate.tex b/talk/expert/variadictemplate.tex
index be012f95..840a6882 100644
--- a/talk/expert/variadictemplate.tex
+++ b/talk/expert/variadictemplate.tex
@@ -166,7 +166,7 @@
 
 \begin{frame}[fragile]
   \frametitlecpp[14]{\texttt{std::integer\_sequence}}
-  \begin{exampleblock}{Example - make\_from\_tuple with helper}
+  \begin{exampleblock}{Example - make\_from\_tuple with helper \hfill \cppinsightLink{https://cppinsights.io/s/f4200401}}
     \begin{cppcode*}{}
       template<typename T,
         typename... Args, std::size_t... Is>