diff --git a/rtl/ibex_tracer_pkg.sv b/rtl/ibex_tracer_pkg.sv
index 71a1e653..438282d9 100644
--- a/rtl/ibex_tracer_pkg.sv
+++ b/rtl/ibex_tracer_pkg.sv
@@ -80,10 +80,13 @@ parameter logic [31:0] INSN_CTZ  = { 12'b011000000001, 5'h?,  3'b001, 5'h?, {OPC
 parameter logic [31:0] INSN_PCNT = { 12'b011000000010, 5'h?,  3'b001, 5'h?, {OPCODE_OP_IMM} };
 parameter logic [31:0] INSN_SEXTB = { 12'b011000000100, 5'h?, 3'b001, 5'h?, {OPCODE_OP_IMM} };
 parameter logic [31:0] INSN_SEXTH = { 12'b011000000101, 5'h?, 3'b001, 5'h?, {OPCODE_OP_IMM} };
+// The ZEXT.B and ZEXT.H pseudo-instructions are currently not emitted by the tracer due to a lack
+// of support in the LLVM and GCC toolchains. Enabling this functionality when the time is right is
+// tracked in https://github.com/lowRISC/ibex/issues/1228
 // sext -- pseudoinstruction: andi rd, rs 255
-parameter logic [31:0] INSN_ZEXTB = { 4'b0000, 8'b11111111, 5'h?, 3'b111, 5'h?, {OPCODE_OP_IMM} };
+// parameter logic [31:0] INSN_ZEXTB = { 4'b0000, 8'b11111111, 5'h?, 3'b111, 5'h?, {OPCODE_OP_IMM} };
 // sext -- pseudoinstruction: pack rd, rs zero
-parameter logic [31:0] INSN_ZEXTH = { 7'b0000100, 5'b00000, 5'h?, 3'b100, 5'h?, {OPCODE_OP} };
+// parameter logic [31:0] INSN_ZEXTH = { 7'b0000100, 5'b00000, 5'h?, 3'b100, 5'h?, {OPCODE_OP} };
 
 parameter logic [31:0] INSN_SLO   = { 7'b0010000, 10'h?, 3'b001, 5'h?, {OPCODE_OP} };
 parameter logic [31:0] INSN_SRO   = { 7'b0010000, 10'h?, 3'b101, 5'h?, {OPCODE_OP} };