Clarify dynamic type comment

VL1.tex

@@ -224,7 +224,7 @@ In haskell expressions are not evaluated until their results are actually needed
 \frametitle{What does \textbf{statically typed} mean?}
 Every haskell expression has a type and types are always checked at \emph{compile-time}. Programs with errors will not compile and definitely not run.\\
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-It is possible to simulate dynamic types however. In the end, they are still statically type-checked (as in: the compiler always knows what's going on).
+It is possible to simulate dynamic types however, i.e. types which may be converted to the type you need them in, following rigid rules. In the end, they are still statically type-checked (as in: the compiler always knows what's going on).
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 \begin{frame}