ERC777 UML contracts

fig/erc777_uml.tex

@@ -109,6 +109,6 @@
   \umlVHVinherit{ExternalERC777Implementation}{ERC777ERC20BaseToken}
 \end{tikzpicture}
 }
-\caption[\acrshort{uml} class diagram of the ERC777 Reference Implementation]{\acrshort{uml} class diagram of the ERC777 Reference Implementation, with the ERC820 dependency and an extran implementation using the \texttt{ERC777ERC20BaseToken}.}
+\caption[\acrshort{uml} class diagram of the ERC777 Reference Implementation]{\acrshort{uml} class diagram of the ERC777 Reference Implementation, with the ERC820 dependency and an extra implementation using the \texttt{ERC777ERC20BaseToken}.}
 \label{fig:erc777uml}
 \end{figure}