diff --git a/docs/Manpage.md b/docs/Manpage.md
index d370b40cd9..b110240007 100644
--- a/docs/Manpage.md
+++ b/docs/Manpage.md
@@ -584,6 +584,8 @@ the upgraded formulae or, every 30 days, for all formulae.
   If brewing fails, open an interactive debugging session with access to IRB or a shell inside the temporary build directory.
 * `-s`, `--build-from-source`:
   Compile *`formula`* from source even if a bottle is available.
+* `-i`, `--interactive`:
+  Download and patch *`formula`*, then open a shell. This allows the user to run `./configure --help` and otherwise determine how to turn the software package into a Homebrew package.
 * `--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.
 * `--fetch-HEAD`:
diff --git a/manpages/brew.1 b/manpages/brew.1
index 0c4704d5a3..2e3bfb15bb 100644
--- a/manpages/brew.1
+++ b/manpages/brew.1
@@ -726,6 +726,10 @@ If brewing fails, open an interactive debugging session with access to IRB or a
 Compile \fIformula\fR from source even if a bottle is available\.
 .
 .TP
+\fB\-i\fR, \fB\-\-interactive\fR
+Download and patch \fIformula\fR, then open a shell\. This allows the user to run \fB\./configure \-\-help\fR and otherwise determine how to turn the software package into a Homebrew package\.
+.
+.TP
 \fB\-\-force\-bottle\fR
 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\.
 .