diff --git a/evm/src/cpu/kernel/asm/rlp/encode.asm b/evm/src/cpu/kernel/asm/rlp/encode.asm
index b2446c37..58cb9230 100644
--- a/evm/src/cpu/kernel/asm/rlp/encode.asm
+++ b/evm/src/cpu/kernel/asm/rlp/encode.asm
@@ -1,17 +1,17 @@
 // RLP-encode a scalar, i.e. a variable-length integer.
-// Pre stack: pos, scalar
+// Pre stack: pos, scalar, retdest
 // Post stack: (empty)
 global encode_rlp_scalar:
     PANIC // TODO: implement
 
 // RLP-encode a fixed-length 160-bit string. Assumes string < 2^160.
-// Pre stack: pos, string
+// Pre stack: pos, string, retdest
 // Post stack: (empty)
 global encode_rlp_160:
     PANIC // TODO: implement
 
 // RLP-encode a fixed-length 256-bit string.
-// Pre stack: pos, string
+// Pre stack: pos, string, retdest
 // Post stack: (empty)
 global encode_rlp_256:
     PANIC // TODO: implement