diff --git a/Library/Homebrew/cmd/--env.rb b/Library/Homebrew/cmd/--env.rb
index a96ddf6dda..f1c3e3e94f 100644
--- a/Library/Homebrew/cmd/--env.rb
+++ b/Library/Homebrew/cmd/--env.rb
@@ -13,7 +13,7 @@ module Homebrew
       usage_banner <<~EOS
         `--env` [<options>]
 
-        Summarize Homebrew's build environment as a plain list.
+        Summarise Homebrew's build environment as a plain list.
 
         If the command's output is sent through a pipe and no shell is specified,
         the list is formatted for export to `bash`(1) unless `--plain` is passed.
diff --git a/Library/Homebrew/cmd/list.rb b/Library/Homebrew/cmd/list.rb
index a6cd43d331..3a1eb4881c 100644
--- a/Library/Homebrew/cmd/list.rb
+++ b/Library/Homebrew/cmd/list.rb
@@ -14,7 +14,7 @@ module Homebrew
 
         List all installed formulae.
 
-        If <formula> is provided, summarize the paths within its current keg.
+        If <formula> is provided, summarise the paths within its current keg.
       EOS
       switch "--full-name",
              description: "Print formulae with fully-qualified names. If `--full-name` is not "\
diff --git a/docs/Manpage.md b/docs/Manpage.md
index 8838ffc578..82a4e5e08e 100644
--- a/docs/Manpage.md
+++ b/docs/Manpage.md
@@ -292,7 +292,7 @@ automatically when you install formulae but can be useful for DIY installations.
 
 List all installed formulae.
 
-If *`formula`* is provided, summarize the paths within its current keg.
+If *`formula`* is provided, summarise the paths within its current keg.
 
 * `--full-name`:
   Print formulae with fully-qualified names. If `--full-name` is not passed, other options (i.e. `-1`, `-l`, `-r` and `-t`) are passed to `ls`(1) which produces the actual output.
@@ -646,7 +646,7 @@ would be installed, without any sort of versioned directory as the last path.
 
 ### `--env` [*`options`*]
 
-Summarize Homebrew's build environment as a plain list.
+Summarise Homebrew's build environment as a plain list.
 
 If the command's output is sent through a pipe and no shell is specified, the
 list is formatted for export to `bash`(1) unless `--plain` is passed.
diff --git a/manpages/brew.1 b/manpages/brew.1
index 14adb9309f..a4dbbf59a3 100644
--- a/manpages/brew.1
+++ b/manpages/brew.1
@@ -381,7 +381,7 @@ Allow keg\-only formulae to be linked\.
 List all installed formulae\.
 .
 .P
-If \fIformula\fR is provided, summarize the paths within its current keg\.
+If \fIformula\fR is provided, summarise the paths within its current keg\.
 .
 .TP
 \fB\-\-full\-name\fR
@@ -813,7 +813,7 @@ Display Homebrew\'s Cellar path\. \fIDefault:\fR \fB$(brew \-\-prefix)/Cellar\fR
 If \fIformula\fR is provided, display the location in the cellar where \fIformula\fR would be installed, without any sort of versioned directory as the last path\.
 .
 .SS "\fB\-\-env\fR [\fIoptions\fR]"
-Summarize Homebrew\'s build environment as a plain list\.
+Summarise Homebrew\'s build environment as a plain list\.
 .
 .P
 If the command\'s output is sent through a pipe and no shell is specified, the list is formatted for export to \fBbash\fR(1) unless \fB\-\-plain\fR is passed\.