diff --git a/code/main/main.cpp b/code/main/main.cpp
index 6956acd..291c700 100644
--- a/code/main/main.cpp
+++ b/code/main/main.cpp
@@ -169,7 +169,7 @@ extern "C" void app_main(void)
    memset(&tx_chan_config, 0, sizeof(tx_chan_config));
 
    tx_chan_config.clk_src = RMT_CLK_SRC_DEFAULT; // select source clock
-   tx_chan_config.gpio_num = RMT_LED_STRIP_GPIO_NUM;
+   tx_chan_config.gpio_num = (gpio_num_t)RMT_LED_STRIP_GPIO_NUM;
    tx_chan_config.mem_block_symbols = 64; // increase the block size can make the LED less flickering
    tx_chan_config.resolution_hz = RMT_LED_STRIP_RESOLUTION_HZ;
    tx_chan_config.trans_queue_depth = 4;
diff --git a/code/main/src/wordmap.cpp b/code/main/src/wordmap.cpp
index 7256638..e783214 100644
--- a/code/main/src/wordmap.cpp
+++ b/code/main/src/wordmap.cpp
@@ -20,6 +20,8 @@
 #include "wordmap.h"
 
 #include "logger.h"
+
+#include <algorithm>
 // --------------------------------------------------------------------------------------------------------------------
 // Constant and macro definitions
 // --------------------------------------------------------------------------------------------------------------------
diff --git a/doc/clock_matrix_inlay.ods b/doc/clock_matrix_inlay.ods
new file mode 100644
index 0000000..109f437
Binary files /dev/null and b/doc/clock_matrix_inlay.ods differ
diff --git a/doc/clock_matrix_inlay.xlsx b/doc/clock_matrix_inlay.xlsx
new file mode 100644
index 0000000..b88a3e3
Binary files /dev/null and b/doc/clock_matrix_inlay.xlsx differ