# beamer user guide example has incorrect keyword

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I copied and pasted the example in beameruserguide.pdf (for version 3.20, dated 1 June 2012) p203, and though no error was produced, the example did not behave as expected. This is because although the section is documenting an option called show notes on second screen, the example uses only notes on second screen, i.e. missing the word show. Adding the word show results in the expected behaviour (but it took me a while to notice what the problem was)!

Here is the extracted example with the erroneous line highlighted:

\documentclass{beamer}
\usepackage{pgfpages}
\setbeameroption{notes on second screen}%<--- this should say "show notes on second screen"
\begin{document}
\begin{frame}
A frame.
\note{This is shown on the right.}
\end{frame}
\end{document}