1 files changed, 4 insertions, 0 deletions
diff --git a/Library/Formula/plowshare.rb b/Library/Formula/plowshare.rb
index 8d2bd0f88..f90b4c00a 100644
--- a/Library/Formula/plowshare.rb
+++ b/Library/Formula/plowshare.rb
@@ -32,6 +32,10 @@ class Plowshare < Formula
     not work if X11 support is not enabled. To enable:
       brew remove imagemagick
       brew install imagemagick --with-x
+
+    Plowshare 4 requires Bash 4+. OS X ships with an old Bash 3 version.
+    To install Bash 4:
+      brew install bash
     EOS
   end
 end