diff --git a/sims/vcs/Makefile b/sims/vcs/Makefile
index f4603bfc..0b71cd30 100644
--- a/sims/vcs/Makefile
+++ b/sims/vcs/Makefile
@@ -32,7 +32,7 @@ default: $(sim)
 debug: $(sim_debug)
 
 #########################################################################################
-# simulaton requirements
+# simulation requirements
 #########################################################################################
 SIM_FILE_REQS += \
 	$(ROCKETCHIP_RSRCS_DIR)/vsrc/TestDriver.v
diff --git a/sims/verilator/Makefile b/sims/verilator/Makefile
index 10674823..2b902467 100644
--- a/sims/verilator/Makefile
+++ b/sims/verilator/Makefile
@@ -50,7 +50,7 @@ SIM_FILE_REQS += \
 	$(CHIPYARD_RSRCS_DIR)/csrc/emulator.cc \
 	$(ROCKETCHIP_RSRCS_DIR)/csrc/verilator.h \
 
-# the following files are needed for emulator.cc to compile (even if they aren't included in RTL)
+# the following files are needed for emulator.cc to compile (even if they aren't part of the RTL build)
 SIM_FILE_REQS += \
 	$(TESTCHIP_RSRCS_DIR)/testchipip/csrc/SimSerial.cc \
 	$(TESTCHIP_RSRCS_DIR)/testchipip/csrc/testchip_tsi.cc \