diff --git a/nostarch/chapter03.md b/nostarch/chapter03.md
index 9fab1ab..f5ab796 100644
--- a/nostarch/chapter03.md
+++ b/nostarch/chapter03.md
@@ -1209,7 +1209,7 @@ This gets rid of a lot of nesting that would be necessary if we used `loop`,
 `if`, `else`, and `break`, and it's more clear. While a condition holds, run
 this code; otherwise, exit the loop.
 
-#### Looping Though a Collection with `for`
+#### Looping Through a Collection with `for`
 
 We could use this `while` construct to loop over the elements of a collection,
 like an array. For example:
diff --git a/src/ch03-05-control-flow.md b/src/ch03-05-control-flow.md
index 9fe780e..f5ead18 100644
--- a/src/ch03-05-control-flow.md
+++ b/src/ch03-05-control-flow.md
@@ -314,7 +314,7 @@ This gets rid of a lot of nesting that would be necessary if we used `loop`,
 `if`, `else`, and `break`, and it's more clear. While a condition holds, run
 this code; otherwise, exit the loop.
 
-#### Looping Though a Collection with `for`
+#### Looping Through a Collection with `for`
 
 We could use this `while` construct to loop over the elements of a collection,
 like an array. For example: