diff --git a/opcodes-rv64m b/rv64_m
similarity index 99%
rename from opcodes-rv64m
rename to rv64_m
index 939c00ce..cfac0b15 100644
--- a/opcodes-rv64m
+++ b/rv64_m
@@ -1,5 +1,4 @@
 # RV64M additions to RV32M
-
 mulw    rd rs1 rs2 31..25=1 14..12=0 6..2=0x0E 1..0=3
 divw    rd rs1 rs2 31..25=1 14..12=4 6..2=0x0E 1..0=3
 divuw   rd rs1 rs2 31..25=1 14..12=5 6..2=0x0E 1..0=3
diff --git a/opcodes-rv32m b/rv_m
similarity index 100%
rename from opcodes-rv32m
rename to rv_m