diff --git a/completions/bash/brew b/completions/bash/brew
index 9ef26c45f9..aae51371d9 100644
--- a/completions/bash/brew
+++ b/completions/bash/brew
@@ -2,7 +2,7 @@
 # This file is automatically generated by running `brew generate-man-completions`.
 # See Library/Homebrew/completions/bash.erb for editing instructions.
 
-if [[ -n ${POSIXLY_CORRECT} ]] || shopt -oq posix
+if [[ -n ${POSIXLY_CORRECT:-} ]] || shopt -oq posix
 then
   echo "Homebrew Bash completions do not work in POSIX mode" 1>&2
   return
diff --git a/docs/Manpage.md b/docs/Manpage.md
index 4b30ad9ec9..38e6b381d9 100644
--- a/docs/Manpage.md
+++ b/docs/Manpage.md
@@ -1111,11 +1111,11 @@ Display the source of a *`formula`* or *`cask`*.
 
 Display the path to the file being used when invoking `brew` *`cmd`*.
 
-### `contributions` *`email|name`* [*`--repositories`*`=`] [*`--csv`*]
+### `contributions` *`email|username`* [*`--repositories`*`=`] [*`--csv`*]
 
 Contributions to Homebrew repos for a user.
 
-The first argument is a name (e.g. "BrewTestBot") or an email address (e.g. "brewtestbot@brew.sh").
+The first argument is a GitHub username (e.g. "BrewTestBot") or an email address (e.g. "brewtestbot@brew.sh").
 
 * `--repositories`:
   Specify a comma-separated (no spaces) list of repositories to search. Supported repositories: `brew`, `core`, `cask`, `aliases`, `autoupdate`, `bundle`, `command-not-found`, `test-bot`, `services`, `cask-drivers`, `cask-fonts` and `cask-versions`. Omitting this flag, or specifying `--repositories=all`, searches all repositories. Use `--repositories=primary` to search only the main repositories: brew,core,cask.
diff --git a/manpages/brew.1 b/manpages/brew.1
index c1fce2e6a8..4b91240b62 100644
--- a/manpages/brew.1
+++ b/manpages/brew.1
@@ -1598,11 +1598,11 @@ Treat all named arguments as casks\.
 .SS "\fBcommand\fR \fIcommand\fR [\.\.\.]"
 Display the path to the file being used when invoking \fBbrew\fR \fIcmd\fR\.
 .
-.SS "\fBcontributions\fR \fIemail|name\fR [\fI\-\-repositories\fR\fB=\fR] [\fI\-\-csv\fR]"
+.SS "\fBcontributions\fR \fIemail|username\fR [\fI\-\-repositories\fR\fB=\fR] [\fI\-\-csv\fR]"
 Contributions to Homebrew repos for a user\.
 .
 .P
-The first argument is a name (e\.g\. "BrewTestBot") or an email address (e\.g\. "brewtestbot@brew\.sh")\.
+The first argument is a GitHub username (e\.g\. "BrewTestBot") or an email address (e\.g\. "brewtestbot@brew\.sh")\.
 .
 .TP
 \fB\-\-repositories\fR