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diff --git a/topics/week1.mdwn b/topics/week1.mdwn
index ee5478c2..70f330ed 100644
--- a/topics/week1.mdwn
+++ b/topics/week1.mdwn
@@ -616,7 +616,7 @@ There are also some [[advanced notes|week1 advanced notes]] extending this week'
 
 ### Summary ###
 
-Here is the hierarcy of **values** that we've talked about so far.
+Here is the hierarchy of **values** that we've talked about so far.
 
 *   Multivalues
 *   Singular values, including:
@@ -640,3 +640,5 @@ We've also talked about a variety of **expressions** in our language, that evalu
 
 The special syntaxes `[10, 20, 30]` are just shorthand for the more offical syntax using `&` and `[]`, and likewise for `{10, 20, 30}`. The `if ... then ... else ...` syntax is just shorthand for a `case`-construction using the literal patterns `'true` and `'false`.
 
+We also talked about **patterns**. These aren't themselves expressions, but form part of some larger expressions.
+