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diff --git a/doc/guides/linux_gsg/sys_reqs.rst b/doc/guides/linux_gsg/sys_reqs.rst
index 29c5f47a..1c6f86a2 100644
--- a/doc/guides/linux_gsg/sys_reqs.rst
+++ b/doc/guides/linux_gsg/sys_reqs.rst
@@ -70,6 +70,15 @@ Compilation of the DPDK
 
     * libnuma-dev in Debian/Ubuntu;
 
+    .. note::
+
+        On systems with NUMA support, `libnuma-dev` (aka `numactl-devel`)
+        is a recommended dependency when `--legacy-mem` switch is used,
+        and a *required* dependency if default memory mode is used.
+        While DPDK will compile and run without `libnuma`
+        even on NUMA-enabled systems,
+        both usability and performance will be degraded.
+
 *   Python, version 2.7+ or 3.2+, to use various helper scripts included in the DPDK package.