diff --git a/README.md b/README.md
index ae77a235a..cf4944e6f 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,8 @@ You can pass the following variables to Redict to customize the build:
 * `USE_JEMALLOC=no MALLOC=libc`: use the libc allocator rather than jemalloc
 * `USE_SYSTEM_JEMALLOC=yes`: use the system's installed jemalloc libraries
    rather than the vendored copy.
+* `USE_SYSTEM_HIREDICT=yes`: use the system's installed hiredict libraries
+  rather than the vendored copy.
 * `BUILD_TLS=yes`: build with TLS support. Requires OpenSSL.
 * `USE_SYSTEMD=yes`: build with systemd support. Requires libsystemd.
 * `PROG_SUFFIX="-suffix"`: Append "-suffix" to executable names