diff --git a/completions/bash/brew b/completions/bash/brew
index b887c28c24..9aad59b04d 100644
--- a/completions/bash/brew
+++ b/completions/bash/brew
@@ -370,6 +370,7 @@ _brew_abv() {
       --installed
       --json
       --quiet
+      --sizes
       --variations
       --verbose
       "
@@ -1389,6 +1390,7 @@ _brew_info() {
       --installed
       --json
       --quiet
+      --sizes
       --variations
       --verbose
       "
diff --git a/completions/fish/brew.fish b/completions/fish/brew.fish
index 931a364eaf..2fbe4652d0 100644
--- a/completions/fish/brew.fish
+++ b/completions/fish/brew.fish
@@ -313,6 +313,7 @@ __fish_brew_complete_arg 'abv' -l help -d 'Show this message'
 __fish_brew_complete_arg 'abv' -l installed -d 'Print JSON of formulae that are currently installed'
 __fish_brew_complete_arg 'abv' -l json -d 'Print a JSON representation. Currently the default value for version is `v1` for formula. For formula and cask use `v2`. See the docs for examples of using the JSON output: https://docs.brew.sh/Querying-Brew'
 __fish_brew_complete_arg 'abv' -l quiet -d 'Make some output more quiet'
+__fish_brew_complete_arg 'abv' -l sizes -d 'Show the size of installed formulae and casks'
 __fish_brew_complete_arg 'abv' -l variations -d 'Include the variations hash in each formula\'s JSON output'
 __fish_brew_complete_arg 'abv' -l verbose -d 'Show more verbose analytics data for formula'
 __fish_brew_complete_arg 'abv; and not __fish_seen_argument -l cask -l casks' -a '(__fish_brew_suggest_formulae_all)'
@@ -941,6 +942,7 @@ __fish_brew_complete_arg 'info' -l help -d 'Show this message'
 __fish_brew_complete_arg 'info' -l installed -d 'Print JSON of formulae that are currently installed'
 __fish_brew_complete_arg 'info' -l json -d 'Print a JSON representation. Currently the default value for version is `v1` for formula. For formula and cask use `v2`. See the docs for examples of using the JSON output: https://docs.brew.sh/Querying-Brew'
 __fish_brew_complete_arg 'info' -l quiet -d 'Make some output more quiet'
+__fish_brew_complete_arg 'info' -l sizes -d 'Show the size of installed formulae and casks'
 __fish_brew_complete_arg 'info' -l variations -d 'Include the variations hash in each formula\'s JSON output'
 __fish_brew_complete_arg 'info' -l verbose -d 'Show more verbose analytics data for formula'
 __fish_brew_complete_arg 'info; and not __fish_seen_argument -l cask -l casks' -a '(__fish_brew_suggest_formulae_all)'
diff --git a/completions/zsh/_brew b/completions/zsh/_brew
index 20ef1bc1eb..e0e7592fb9 100644
--- a/completions/zsh/_brew
+++ b/completions/zsh/_brew
@@ -431,6 +431,7 @@ _brew_abv() {
     '(--eval-all --all)--installed[Print JSON of formulae that are currently installed]' \
     '(--fetch-manifest)--json[Print a JSON representation. Currently the default value for version is `v1` for formula. For formula and cask use `v2`. See the docs for examples of using the JSON output: https://docs.brew.sh/Querying-Brew]' \
     '--quiet[Make some output more quiet]' \
+    '--sizes[Show the size of installed formulae and casks]' \
     '--variations[Include the variations hash in each formula'\''s JSON output]' \
     '--verbose[Show more verbose analytics data for formula]' \
     - formula \
@@ -1180,6 +1181,7 @@ _brew_info() {
     '(--eval-all --all)--installed[Print JSON of formulae that are currently installed]' \
     '(--fetch-manifest)--json[Print a JSON representation. Currently the default value for version is `v1` for formula. For formula and cask use `v2`. See the docs for examples of using the JSON output: https://docs.brew.sh/Querying-Brew]' \
     '--quiet[Make some output more quiet]' \
+    '--sizes[Show the size of installed formulae and casks]' \
     '--variations[Include the variations hash in each formula'\''s JSON output]' \
     '--verbose[Show more verbose analytics data for formula]' \
     - formula \
diff --git a/docs/Manpage.md b/docs/Manpage.md
index 3f714f0af4..d0f61174d8 100644
--- a/docs/Manpage.md
+++ b/docs/Manpage.md
@@ -742,6 +742,10 @@ Display brief statistics for your Homebrew installation. If a *`formula`* or
 
 : Treat all named arguments as casks.
 
+`--sizes`
+
+: Show the size of installed formulae and casks.
+
 ### `install` \[*`options`*\] *`formula`*\|*`cask`* \[...\]
 
 Install a *`formula`* or *`cask`*. Additional options specific to a *`formula`*
diff --git a/manpages/brew.1 b/manpages/brew.1
index 5b483868a9..6650acd069 100644
--- a/manpages/brew.1
+++ b/manpages/brew.1
@@ -463,6 +463,9 @@ Treat all named arguments as formulae\.
 .TP
 \fB\-\-cask\fP
 Treat all named arguments as casks\.
+.TP
+\fB\-\-sizes\fP
+Show the size of installed formulae and casks\.
 .SS "\fBinstall\fP \fR[\fIoptions\fP] \fIformula\fP|\fIcask\fP \fR[\.\.\.]"
 Install a \fIformula\fP or \fIcask\fP\&\. Additional options specific to a \fIformula\fP may be appended to the command\.
 .P