diff --git a/INSTALL b/INSTALL
index 4ce6651b6b3422a549bbb0939f6e1725100fa4c6..86412c718161e5c7d9a504097b5cec3bd5fc462f 100644
--- a/INSTALL
+++ b/INSTALL
@@ -326,6 +326,11 @@
                    Don't build support for datagram based BIOs. Selecting this
                    option will also force the disabling of DTLS.
 
+  enable-devcryptoeng
+                   Build the /dev/crypto engine.  It is automatically selected
+                   on BSD implementations, in which case it can be disabled with
+                   no-devcryptoeng.
+
   no-dso
                    Don't build support for loading Dynamic Shared Objects.