diff --git a/client/src/util.c b/client/src/util.c
index 80def08ef..808f147f0 100644
--- a/client/src/util.c
+++ b/client/src/util.c
@@ -791,15 +791,6 @@ uint32_t PackBits(uint8_t start, uint8_t len, uint8_t *bits) {
     return tmp;
 }
 
-/*
-uint8_t pw_rev_A(uint8_t b) {
-    b = (b & 0xF0) >> 4 | (b & 0x0F) << 4;
-    b = (b & 0xCC) >> 2 | (b & 0x33) << 2;
-    b = (b & 0xAA) >> 1 | (b & 0x55) << 1;
-    return b;
-}
-*/
-
 uint64_t HornerScheme(uint64_t num, uint64_t divider, uint64_t factor) {
     uint64_t remaind = 0, quotient = 0, result = 0;
     remaind = num % divider;
diff --git a/client/src/util.h b/client/src/util.h
index c15183734..156c3a089 100644
--- a/client/src/util.h
+++ b/client/src/util.h
@@ -54,9 +54,12 @@ void print_blocks(uint32_t *data, size_t len);
 int hex_to_bytes(const char *hexValue, uint8_t *bytesValue, size_t maxBytesValueLen);
 void num_to_bytebits(uint64_t n, size_t len, uint8_t *dest);
 void num_to_bytebitsLSBF(uint64_t n, size_t len, uint8_t *dest);
+
+// Swap endian on arrays up to 64bytes.
 uint8_t *SwapEndian64(const uint8_t *src, const size_t len, const uint8_t blockSize);
 void SwapEndian64ex(const uint8_t *src, const size_t len, const uint8_t blockSize, uint8_t *dest);
 
+// parameter helper functions
 int param_getlength(const char *line, int paramnum);
 char param_getchar(const char *line, int paramnum);
 char param_getchar_indx(const char *line, int indx, int paramnum);