diff --git a/README.md b/README.md
index 14caf183d..ae77a235a 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,8 @@ toolchain, and GNU make. To build Redict, simply run "make".
 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.
 * `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