diff --git a/completions/bash/brew b/completions/bash/brew
index 457a51ca74..448c975359 100644
--- a/completions/bash/brew
+++ b/completions/bash/brew
@@ -1099,6 +1099,7 @@ _brew_instal() {
     -*)
       __brewcomp "
       --HEAD
+      --adopt
       --appdir
       --audio-unit-plugindir
       --binaries
@@ -1159,6 +1160,7 @@ _brew_install() {
     -*)
       __brewcomp "
       --HEAD
+      --adopt
       --appdir
       --audio-unit-plugindir
       --binaries
@@ -1727,6 +1729,7 @@ _brew_reinstall() {
   case "${cur}" in
     -*)
       __brewcomp "
+      --adopt
       --appdir
       --audio-unit-plugindir
       --binaries
diff --git a/completions/fish/brew.fish b/completions/fish/brew.fish
index ad8341c2fe..e2b781fa0b 100644
--- a/completions/fish/brew.fish
+++ b/completions/fish/brew.fish
@@ -785,6 +785,7 @@ __fish_brew_complete_arg 'info; and not __fish_seen_argument -l formula -l formu
 
 __fish_brew_complete_cmd 'instal' 'Install a formula or cask'
 __fish_brew_complete_arg 'instal' -l HEAD -d 'If formula defines it, install the HEAD version, aka. main, trunk, unstable, master'
+__fish_brew_complete_arg 'instal' -l adopt -d 'Adopt existing artifacts in the destination that are identical to those being installed. Cannot be combined with --force'
 __fish_brew_complete_arg 'instal' -l appdir -d 'Target location for Applications (default: `/Applications`)'
 __fish_brew_complete_arg 'instal' -l audio-unit-plugindir -d 'Target location for Audio Unit Plugins (default: `~/Library/Audio/Plug-Ins/Components`)'
 __fish_brew_complete_arg 'instal' -l binaries -d 'Disable/enable linking of helper executables (default: enabled)'
@@ -836,6 +837,7 @@ __fish_brew_complete_arg 'instal; and not __fish_seen_argument -l formula -l for
 
 __fish_brew_complete_cmd 'install' 'Install a formula or cask'
 __fish_brew_complete_arg 'install' -l HEAD -d 'If formula defines it, install the HEAD version, aka. main, trunk, unstable, master'
+__fish_brew_complete_arg 'install' -l adopt -d 'Adopt existing artifacts in the destination that are identical to those being installed. Cannot be combined with --force'
 __fish_brew_complete_arg 'install' -l appdir -d 'Target location for Applications (default: `/Applications`)'
 __fish_brew_complete_arg 'install' -l audio-unit-plugindir -d 'Target location for Audio Unit Plugins (default: `~/Library/Audio/Plug-Ins/Components`)'
 __fish_brew_complete_arg 'install' -l binaries -d 'Disable/enable linking of helper executables (default: enabled)'
@@ -1188,6 +1190,7 @@ __fish_brew_complete_arg 'readall' -a '(__fish_brew_suggest_taps_installed)'
 
 
 __fish_brew_complete_cmd 'reinstall' 'Uninstall and then reinstall a formula or cask using the same options it was originally installed with, plus any appended options specific to a formula'
+__fish_brew_complete_arg 'reinstall' -l adopt -d 'Adopt existing artifacts in the destination that are identical to those being installed. Cannot be combined with --force'
 __fish_brew_complete_arg 'reinstall' -l appdir -d 'Target location for Applications (default: `/Applications`)'
 __fish_brew_complete_arg 'reinstall' -l audio-unit-plugindir -d 'Target location for Audio Unit Plugins (default: `~/Library/Audio/Plug-Ins/Components`)'
 __fish_brew_complete_arg 'reinstall' -l binaries -d 'Disable/enable linking of helper executables (default: enabled)'
diff --git a/completions/zsh/_brew b/completions/zsh/_brew
index cf07188939..57ced64ab2 100644
--- a/completions/zsh/_brew
+++ b/completions/zsh/_brew
@@ -971,6 +971,7 @@ _brew_info() {
 _brew_instal() {
   _arguments \
     '(--cask)--HEAD[If formula defines it, install the HEAD version, aka. main, trunk, unstable, master]' \
+    '(--formula --force)--adopt[Adopt existing artifacts in the destination that are identical to those being installed. Cannot be combined with --force]' \
     '(--formula)--appdir[Target location for Applications (default: `/Applications`)]' \
     '(--formula)--audio-unit-plugindir[Target location for Audio Unit Plugins (default: `~/Library/Audio/Plug-Ins/Components`)]' \
     '(--formula)--binaries[Disable/enable linking of helper executables (default: enabled)]' \
@@ -986,7 +987,7 @@ _brew_instal() {
     '--dry-run[Show what would be installed, but do not actually install anything]' \
     '(--cask)--fetch-HEAD[Fetch the upstream repository to detect if the HEAD installation of the formula is outdated. Otherwise, the repository'\''s HEAD will only be checked for updates when a new stable or development version has been released]' \
     '(--formula)--fontdir[Target location for Fonts (default: `~/Library/Fonts`)]' \
-    '--force[Install formulae without checking for previously installed keg-only or non-migrated versions. When installing casks, overwrite existing files (binaries and symlinks are excluded, unless originally from the same cask)]' \
+    '(--adopt)--force[Install formulae without checking for previously installed keg-only or non-migrated versions. When installing casks, overwrite existing files (binaries and symlinks are excluded, unless originally from the same cask)]' \
     '(--cask --build-from-source --build-bottle)--force-bottle[Install from a bottle if it exists for the current or newest version of macOS, even if it would not normally be used for installation]' \
     '(--cask)--git[Create a Git repository, useful for creating patches to the software]' \
     '--help[Show this message]' \
@@ -1015,7 +1016,7 @@ _brew_instal() {
     '(--formula)--vst3-plugindir[Target location for VST3 Plugins (default: `~/Library/Audio/Plug-Ins/VST3`)]' \
     '(--formula)--zap[For use with `brew reinstall --cask`. Remove all files associated with a cask. *May remove files which are shared between applications.*]' \
     - formula \
-    '(--casks --binaries --require-sha --quarantine --skip-cask-deps --zap --appdir --colorpickerdir --prefpanedir --qlplugindir --mdimporterdir --dictionarydir --fontdir --servicedir --input-methoddir --internet-plugindir --audio-unit-plugindir --vst-plugindir --vst3-plugindir --screen-saverdir --language)--formula[Treat all named arguments as formulae]' \
+    '(--casks --binaries --require-sha --quarantine --adopt --skip-cask-deps --zap --appdir --colorpickerdir --prefpanedir --qlplugindir --mdimporterdir --dictionarydir --fontdir --servicedir --input-methoddir --internet-plugindir --audio-unit-plugindir --vst-plugindir --vst3-plugindir --screen-saverdir --language)--formula[Treat all named arguments as formulae]' \
     '*::formula:__brew_formulae' \
     - cask \
     '(--formulae --env --ignore-dependencies --only-dependencies --cc --build-from-source --force-bottle --include-test --HEAD --fetch-HEAD --keep-tmp --debug-symbols --build-bottle --bottle-arch --display-times --interactive --git --overwrite)--cask[Treat all named arguments as casks]' \
@@ -1026,6 +1027,7 @@ _brew_instal() {
 _brew_install() {
   _arguments \
     '(--cask)--HEAD[If formula defines it, install the HEAD version, aka. main, trunk, unstable, master]' \
+    '(--formula --force)--adopt[Adopt existing artifacts in the destination that are identical to those being installed. Cannot be combined with --force]' \
     '(--formula)--appdir[Target location for Applications (default: `/Applications`)]' \
     '(--formula)--audio-unit-plugindir[Target location for Audio Unit Plugins (default: `~/Library/Audio/Plug-Ins/Components`)]' \
     '(--formula)--binaries[Disable/enable linking of helper executables (default: enabled)]' \
@@ -1041,7 +1043,7 @@ _brew_install() {
     '--dry-run[Show what would be installed, but do not actually install anything]' \
     '(--cask)--fetch-HEAD[Fetch the upstream repository to detect if the HEAD installation of the formula is outdated. Otherwise, the repository'\''s HEAD will only be checked for updates when a new stable or development version has been released]' \
     '(--formula)--fontdir[Target location for Fonts (default: `~/Library/Fonts`)]' \
-    '--force[Install formulae without checking for previously installed keg-only or non-migrated versions. When installing casks, overwrite existing files (binaries and symlinks are excluded, unless originally from the same cask)]' \
+    '(--adopt)--force[Install formulae without checking for previously installed keg-only or non-migrated versions. When installing casks, overwrite existing files (binaries and symlinks are excluded, unless originally from the same cask)]' \
     '(--cask --build-from-source --build-bottle)--force-bottle[Install from a bottle if it exists for the current or newest version of macOS, even if it would not normally be used for installation]' \
     '(--cask)--git[Create a Git repository, useful for creating patches to the software]' \
     '--help[Show this message]' \
@@ -1070,7 +1072,7 @@ _brew_install() {
     '(--formula)--vst3-plugindir[Target location for VST3 Plugins (default: `~/Library/Audio/Plug-Ins/VST3`)]' \
     '(--formula)--zap[For use with `brew reinstall --cask`. Remove all files associated with a cask. *May remove files which are shared between applications.*]' \
     - formula \
-    '(--casks --binaries --require-sha --quarantine --skip-cask-deps --zap --appdir --colorpickerdir --prefpanedir --qlplugindir --mdimporterdir --dictionarydir --fontdir --servicedir --input-methoddir --internet-plugindir --audio-unit-plugindir --vst-plugindir --vst3-plugindir --screen-saverdir --language)--formula[Treat all named arguments as formulae]' \
+    '(--casks --binaries --require-sha --quarantine --adopt --skip-cask-deps --zap --appdir --colorpickerdir --prefpanedir --qlplugindir --mdimporterdir --dictionarydir --fontdir --servicedir --input-methoddir --internet-plugindir --audio-unit-plugindir --vst-plugindir --vst3-plugindir --screen-saverdir --language)--formula[Treat all named arguments as formulae]' \
     '*::formula:__brew_formulae' \
     - cask \
     '(--formulae --env --ignore-dependencies --only-dependencies --cc --build-from-source --force-bottle --include-test --HEAD --fetch-HEAD --keep-tmp --debug-symbols --build-bottle --bottle-arch --display-times --interactive --git --overwrite)--cask[Treat all named arguments as casks]' \
@@ -1450,6 +1452,7 @@ _brew_readall() {
 # brew reinstall
 _brew_reinstall() {
   _arguments \
+    '(--formula)--adopt[Adopt existing artifacts in the destination that are identical to those being installed. Cannot be combined with --force]' \
     '(--formula)--appdir[Target location for Applications (default: `/Applications`)]' \
     '(--formula)--audio-unit-plugindir[Target location for Audio Unit Plugins (default: `~/Library/Audio/Plug-Ins/Components`)]' \
     '(--formula)--binaries[Disable/enable linking of helper executables (default: enabled)]' \
@@ -1485,7 +1488,7 @@ _brew_reinstall() {
     '(--formula)--vst3-plugindir[Target location for VST3 Plugins (default: `~/Library/Audio/Plug-Ins/VST3`)]' \
     '(--formula)--zap[For use with `brew reinstall --cask`. Remove all files associated with a cask. *May remove files which are shared between applications.*]' \
     - formula \
-    '(--casks --binaries --require-sha --quarantine --skip-cask-deps --zap --appdir --colorpickerdir --prefpanedir --qlplugindir --mdimporterdir --dictionarydir --fontdir --servicedir --input-methoddir --internet-plugindir --audio-unit-plugindir --vst-plugindir --vst3-plugindir --screen-saverdir --language)--formula[Treat all named arguments as formulae]' \
+    '(--casks --binaries --require-sha --quarantine --adopt --skip-cask-deps --zap --appdir --colorpickerdir --prefpanedir --qlplugindir --mdimporterdir --dictionarydir --fontdir --servicedir --input-methoddir --internet-plugindir --audio-unit-plugindir --vst-plugindir --vst3-plugindir --screen-saverdir --language)--formula[Treat all named arguments as formulae]' \
     '*::formula:__brew_formulae' \
     - cask \
     '(--formulae --build-from-source --interactive --force-bottle --keep-tmp --debug-symbols --display-times --git)--cask[Treat all named arguments as casks]' \
diff --git a/docs/Manpage.md b/docs/Manpage.md
index 9d612d6556..f0ea1f962c 100644
--- a/docs/Manpage.md
+++ b/docs/Manpage.md
@@ -373,6 +373,8 @@ is already installed but outdated.
   Require all casks to have a checksum.
 * `--[no-]quarantine`:
   Disable/enable quarantining of downloads (default: enabled).
+* `--adopt`:
+  Adopt existing artifacts in the destination that are identical to those being installed. Cannot be combined with --force.
 * `--skip-cask-deps`:
   Skip installing cask dependencies.
 * `--zap`:
@@ -572,6 +574,8 @@ reinstalled formulae or, every 30 days, for all formulae.
   Require all casks to have a checksum.
 * `--[no-]quarantine`:
   Disable/enable quarantining of downloads (default: enabled).
+* `--adopt`:
+  Adopt existing artifacts in the destination that are identical to those being installed. Cannot be combined with --force.
 * `--skip-cask-deps`:
   Skip installing cask dependencies.
 * `--zap`:
diff --git a/manpages/brew.1 b/manpages/brew.1
index 029b72fb91..bdaceab3e1 100644
--- a/manpages/brew.1
+++ b/manpages/brew.1
@@ -520,6 +520,10 @@ Require all casks to have a checksum\.
 Disable/enable quarantining of downloads (default: enabled)\.
 .
 .TP
+\fB\-\-adopt\fR
+Adopt existing artifacts in the destination that are identical to those being installed\. Cannot be combined with \-\-force\.
+.
+.TP
 \fB\-\-skip\-cask\-deps\fR
 Skip installing cask dependencies\.
 .
@@ -805,6 +809,10 @@ Require all casks to have a checksum\.
 Disable/enable quarantining of downloads (default: enabled)\.
 .
 .TP
+\fB\-\-adopt\fR
+Adopt existing artifacts in the destination that are identical to those being installed\. Cannot be combined with \-\-force\.
+.
+.TP
 \fB\-\-skip\-cask\-deps\fR
 Skip installing cask dependencies\.
 .