diff --git a/Formula/curl-ca-bundle.rb b/Formula/curl-ca-bundle.rb
index fcd563b45d..9b2027bbe8 100644
--- a/Formula/curl-ca-bundle.rb
+++ b/Formula/curl-ca-bundle.rb
@@ -8,4 +8,11 @@ class CurlCaBundle < Formula
   def install
     share.install 'ca-bundle.crt'
   end
+
+  def caveats; <<-EOS.undent
+    To use these certificates with OpenSSL:
+
+      export SSL_CERT_FILE=#{opt_prefix}/share/ca-bundle.crt
+    EOS
+  end
 end