diff --git a/src/hw/shuttler.md b/src/hw/shuttler.md
index 9d2fab8..32211fe 100644
--- a/src/hw/shuttler.md
+++ b/src/hw/shuttler.md
@@ -19,6 +19,11 @@ and then store the value into the flash memory/SD Card.
 
 ## Hardware Configurations and Connections
 
+### EFC to FMC CLK Configurations
+
+C217, C218, C213, C214 should be fitted to pass the EFC analog clock source to the Shutter FMC board. If they are incorrectly configured, the EFC board will panic at "DAC AD9117 retiming failure".
+![efc_to_fmc_clk_cfg](../img/efc_to_fmc_clk_config.png)
+
 ### EEM Cable Connection
 
 Only the EEM0 port on the EFC board is used. The EEM Cable provides power. You can ignore the barrel jack at
diff --git a/src/img/efc_to_fmc_clk_config.png b/src/img/efc_to_fmc_clk_config.png
new file mode 100644
index 0000000..ca15316
Binary files /dev/null and b/src/img/efc_to_fmc_clk_config.png differ