diff --git a/rv64_zba b/rv64_zba
index 5378e52f..3a1186aa 100644
--- a/rv64_zba
+++ b/rv64_zba
@@ -3,3 +3,5 @@ sh1add.uw  rd rs1 rs2 31..25=16 14..12=2 6..2=0x0E 1..0=3
 sh2add.uw  rd rs1 rs2 31..25=16 14..12=4 6..2=0x0E 1..0=3
 sh3add.uw  rd rs1 rs2 31..25=16 14..12=6 6..2=0x0E 1..0=3
 slli.uw    rd rs1 31..26=2 shamtd 14..12=1 6..2=0x06 1..0=3
+
+$pseudo_op rv64_zba::add.uw zext.w rd rs1 31..25=4 24..20=0 14..12=0 6..2=0x0E 1..0=3
diff --git a/rv64_zcb b/rv64_zcb
index ed38047e..c47d0114 100644
--- a/rv64_zcb
+++ b/rv64_zcb
@@ -1 +1,3 @@
 c.zext.w  rd_rs1_p 1..0=1 15..13=4 12..10=7 6..5=3 4..2=4
+
+$pseudo_op rv64_c::c.addiw c.sext.w  rd_rs1_n0 15..13=1 12=0 6..2=0 1..0=1