diff --git a/libs/core/_locales/core-strings.json b/libs/core/_locales/core-strings.json
index 00fd873a..59d31f40 100644
--- a/libs/core/_locales/core-strings.json
+++ b/libs/core/_locales/core-strings.json
@@ -365,6 +365,8 @@
   "serial.readUntil|block": "serial|read until %delimiter=serial_delimiter_conv",
   "serial.redirectToUSB|block": "serial|redirect to USB",
   "serial.redirect|block": "serial|redirect to|TX %tx|RX %rx|at baud rate %rate",
+  "serial.setRxBufferSize|block": "serial set rx buffer size to $size",
+  "serial.setTxBufferSize|block": "serial set tx buffer size to $size",
   "serial.writeBuffer|block": "serial|write buffer %buffer=serial_readbuffer",
   "serial.writeLine|block": "serial|write line %text",
   "serial.writeNumbers|block": "serial|write numbers %values",
diff --git a/libs/core/serial.cpp b/libs/core/serial.cpp
index 814ecf4d..2ffef1c1 100644
--- a/libs/core/serial.cpp
+++ b/libs/core/serial.cpp
@@ -195,6 +195,8 @@ namespace serial {
     * @param size length of the rx buffer in bytes, eg: 32
     */
     //% help=reference/serial/set-rx-buffer-size
+    //% blockId=serialSetRxBufferSize block="serial set rx buffer size to $size"
+    //% advanced=true
     void setRxBufferSize(uint8_t size) {
       uBit.serial.setRxBufferSize(size);
     }
@@ -204,8 +206,9 @@ namespace serial {
     * @param size length of the tx buffer in bytes, eg: 32
     */
     //% help=reference/serial/set-tx-buffer-size
+    //% blockId=serialSetTxBufferSize block="serial set tx buffer size to $size"
+    //% advanced=true
     void setTxBufferSize(uint8_t size) {
       uBit.serial.setTxBufferSize(size);
     }
-
 }
diff --git a/libs/core/shims.d.ts b/libs/core/shims.d.ts
index 5d882261..b0082c35 100644
--- a/libs/core/shims.d.ts
+++ b/libs/core/shims.d.ts
@@ -869,14 +869,18 @@ declare namespace serial {
      * Sets the size of the RX buffer in bytes
      * @param size length of the rx buffer in bytes, eg: 32
      */
-    //% help=reference/serial/set-rx-buffer-size shim=serial::setRxBufferSize
+    //% help=reference/serial/set-rx-buffer-size
+    //% blockId=serialSetRxBufferSize block="serial set rx buffer size to $size"
+    //% advanced=true shim=serial::setRxBufferSize
     function setRxBufferSize(size: uint8): void;
 
     /**
      * Sets the size of the TX buffer in bytes
      * @param size length of the tx buffer in bytes, eg: 32
      */
-    //% help=reference/serial/set-tx-buffer-size shim=serial::setTxBufferSize
+    //% help=reference/serial/set-tx-buffer-size
+    //% blockId=serialSetTxBufferSize block="serial set tx buffer size to $size"
+    //% advanced=true shim=serial::setTxBufferSize
     function setTxBufferSize(size: uint8): void;
 }