diff --git a/include/zephyr/sys/spsc_pbuf.h b/include/zephyr/sys/spsc_pbuf.h
index 0e7f018fa63..a65d15cc5c4 100644
--- a/include/zephyr/sys/spsc_pbuf.h
+++ b/include/zephyr/sys/spsc_pbuf.h
@@ -25,7 +25,11 @@ extern "C" {
  * @{
  */
 
-/** @brief Flag indicating that cache shall be handled. */
+/** @brief Flag indicating that cache shall be handled.
+ *
+ * It shall be used only when packet buffer is shared between two cores as on a single
+ * core cache shall not be handled manually because it results in data corruption.
+ */
 #define SPSC_PBUF_CACHE BIT(0)
 
 /** @brief Size of the field which stores maximum utilization. */
diff --git a/lib/os/Kconfig b/lib/os/Kconfig
index fa52338e525..9ce3be2a66e 100644
--- a/lib/os/Kconfig
+++ b/lib/os/Kconfig
@@ -60,7 +60,9 @@ config SPSC_PBUF_CACHE_ALWAYS
 	bool "Always handle cache"
 	help
 	  Handle cache writeback and invalidation for all instances. Option used
-	  to avoid runtime check and thus reduce memory footprint.
+	  to avoid runtime check and thus reduce memory footprint. Beware! It shall
+	  be used only if all packet buffer instances are used for data sharing
+	  between cores.
 
 config SPSC_PBUF_CACHE_NEVER
 	bool "Never handle cache"