diff --git a/manpages/brew.1 b/manpages/brew.1
index 525eeddfd8..ca41e7ba4b 100644
--- a/manpages/brew.1
+++ b/manpages/brew.1
@@ -1799,6 +1799,10 @@ Output this many lines of output on formula \fBsystem\fR failures\.
 \fIDefault:\fR \fB15\fR\.
 .
 .TP
+\fBHOMEBREW_FORBIDDEN_LICENSES\fR
+Use this environment variable to define a blacklist of space separated licenses and Homebrew will avoid installing the packages with those licenses\.
+.
+.TP
 \fBHOMEBREW_FORCE_BREWED_CURL\fR
 If set, always use a Homebrew\-installed \fBcurl\fR(1) rather than the system version\. Automatically set if the system version of \fBcurl\fR is too old\.
 .