diff --git a/M_CAN Driver Usage   Device Tree.md b/M_CAN Driver Usage   Device Tree.md
index ede54d5..ad89f5d 100644
--- a/M_CAN Driver Usage   Device Tree.md	
+++ b/M_CAN Driver Usage   Device Tree.md	
@@ -42,4 +42,12 @@ It is necessary to configure interrupt line 0 of the M_CAN according to your SoC
 
 ### Clocks
 
-The M_CAN needs two clocks. The first clock *hclk*
\ No newline at end of file
+The M_CAN needs two clocks. The first clock *hclk* is used for the internal bus interface. Thesecond clock *cclk* is used for the CAN communication. It should be one of the following values:
+
+clk = {20 MHz, 40 MHz, 80 MHz}
+
+It is important, due to internal clock crossings, that *hclk* is always higher or equal to *cclk*.
+
+## MRAM Config
+
+The last device tree value configures the setup and layout of the MRAM (message RAM).
\ No newline at end of file