diff --git a/forallx-yyc-what.tex b/forallx-yyc-what.tex
index 75e79fb..ca64070 100644
--- a/forallx-yyc-what.tex
+++ b/forallx-yyc-what.tex
@@ -7,7 +7,7 @@ \part{Key notions of logic}
 \chapter{Arguments}
 \label{s:Arguments}
 
-Logic has \emph{many} uses, as mention in the~\hyperref[preface]{preface}. What we will be focussing on here is its use in evaluating arguments; sorting the good from the bad.
+Logic has \emph{many} uses, as mentioned in the~\hyperref[preface]{preface}. What we will be focusing on here is its use in evaluating arguments; sorting the good from the bad.
 
 In everyday language, we sometimes use the word `argument' to talk about belligerent shouting matches.  If you and a friend have an argument in this sense, things are not going well between the two of you. Logic is not concerned with such teeth-gnashing and hair-pulling. They are not arguments, in our sense; they are just disagreements.