diff --git a/src/soc/sifive/fu540/ux00ddr.h b/src/soc/sifive/fu540/ux00ddr.h
index 14a628d..cc67508 100644
--- a/src/soc/sifive/fu540/ux00ddr.h
+++ b/src/soc/sifive/fu540/ux00ddr.h
@@ -82,14 +82,14 @@
 
 static inline void ux00ddr_mask_outofrange_interrupts(size_t ahbregaddr) {
   // Mask off Bit 8, Bit 2 and Bit 1 of Interrupt Status
-  // Bit [2] Multiple accesses outside the defined PHYSICAL memory space have occured
-  // Bit [1] A memory access outside the defined PHYSICAL memory space has occured
+  // Bit [2] Multiple accesses outside the defined PHYSICAL memory space have occurred
+  // Bit [1] A memory access outside the defined PHYSICAL memory space has occurred
   _REG32(136<<2, ahbregaddr) |= ((1<<OUT_OF_RANGE_OFFSET) | (1<<MULTIPLE_OUT_OF_RANGE_OFFSET));
 }
 
 static inline void ux00ddr_mask_port_command_error_interrupt(size_t ahbregaddr) {
   // Mask off Bit 7 of Interrupt Status
-  // Bit [7] An error occured on the port command channel
+  // Bit [7] An error occurred on the port command channel
   _REG32(136<<2, ahbregaddr) |= (1<<PORT_COMMAND_CHANNEL_ERROR_OFFSET);
 }