diff --git a/sdkconfig.defaults b/sdkconfig.defaults
index a085ea9..1a36545 100644
--- a/sdkconfig.defaults
+++ b/sdkconfig.defaults
@@ -24,3 +24,7 @@ CONFIG_ETH_TRANSMIT_MUTEX=y
 # use 7, leaving ~3 for web clients (httpd allows 7): a browser's keep-alive connections then
 # starve new requests. 16 = 7 others + 7 web clients + OTA self-test client + 1 spare.
 CONFIG_LWIP_MAX_SOCKETS=16
+
+# 32 MB PSRAM in the P4 package (hex mode, 200 MHz; 250 MHz needs rev >= 3). Needed for step 7:
+# HLS segment buffers, cspot, decoders. malloc() puts blocks >16 KB in PSRAM; DMA buffers stay internal.
+CONFIG_SPIRAM=y