diff --git a/concepts/first-class-functions/about.md b/concepts/first-class-functions/about.md
index dc9a4dd94..4ba268ad0 100644
--- a/concepts/first-class-functions/about.md
+++ b/concepts/first-class-functions/about.md
@@ -22,8 +22,8 @@ greeting = espGreeting
 fmt.Println(greeting("Alice")) 	// ¡Hola Alice, mucho gusto!
 ```
 
-Function values provide an opportunity to parametrize functions not only with data but with behavior too.
-In the following example, we are passing behaviour to the `dialog` function via the `greetingFunc` parameter:
+Function values provide an opportunity to parameterize functions not only with data but with behavior too.
+In the following example, we are passing behavior to the `dialog` function via the `greetingFunc` parameter:
 
 ```go
 func dialog(name string, greetingFunc func(string) string) {
diff --git a/concepts/first-class-functions/introduction.md b/concepts/first-class-functions/introduction.md
index f19e4b1f4..be99015f4 100644
--- a/concepts/first-class-functions/introduction.md
+++ b/concepts/first-class-functions/introduction.md
@@ -22,8 +22,8 @@ greeting = espGreeting
 fmt.Println(greeting("Alice")) 	// ¡Hola Alice, mucho gusto!
 ```
 
-Function values provide an opportunity to parametrize functions not only with data but with behavior too.
-In the following example, we are passing behaviour to the `dialog` function via the `greetingFunc` parameter:
+Function values provide an opportunity to parameterize functions not only with data but with behavior too.
+In the following example, we are passing behavior to the `dialog` function via the `greetingFunc` parameter:
 
 ```go
 func dialog(name string, greetingFunc func(string) string) {
diff --git a/exercises/concept/expenses/.docs/introduction.md b/exercises/concept/expenses/.docs/introduction.md
index a88cb46a1..1b9c7c82a 100644
--- a/exercises/concept/expenses/.docs/introduction.md
+++ b/exercises/concept/expenses/.docs/introduction.md
@@ -22,8 +22,8 @@ greeting = espGreeting
 fmt.Println(greeting("Alice")) 	// ¡Hola Alice, mucho gusto!
 ```
 
-Function values provide an opportunity to parametrize functions not only with data but with behavior too.
-In the following example, we are passing behaviour to the `dialog` function via the `greetingFunc` parameter:
+Function values provide an opportunity to parameterize functions not only with data but with behavior too.
+In the following example, we are passing behavior to the `dialog` function via the `greetingFunc` parameter:
 
 ```go
 func dialog(name string, greetingFunc func(string) string) {