diff --git a/src/cryptonote_config.h b/src/cryptonote_config.h
index 50b5e1db0..e2e821b80 100644
--- a/src/cryptonote_config.h
+++ b/src/cryptonote_config.h
@@ -178,7 +178,7 @@
 #define HF_VERSION_REJECT_SIGS_IN_COINBASE      15
 #define HF_VERSION_ENFORCE_MIN_AGE              15
 #define HF_VERSION_EFFECTIVE_SHORT_TERM_MEDIAN_IN_PENALTY 15
-#define HF_VERSION_SHA3_POW                     16 // Block 288,888 ~8 February 2021
+#define HF_VERSION_SHA3_POW                     16 // Block 288,888 ~8 February 2021, depends on availability of open source sha-3 fpga designs
 
 #define PER_KB_FEE_QUANTIZATION_DECIMALS        8
 
diff --git a/src/hardforks/hardforks.cpp b/src/hardforks/hardforks.cpp
index fd30a37e7..e2433fa08 100644
--- a/src/hardforks/hardforks.cpp
+++ b/src/hardforks/hardforks.cpp
@@ -41,7 +41,7 @@ const hardfork_t mainnet_hard_forks[] = {
   { 13, 114969, 0, 1559292691 },
   { 14, 115257, 0, 1559292774 },
   { 15, 160777, 0, 1573280497 },
-  { 16, 288888, 0, 1589210508 },
+  //{ 16, 288888, 0, 1589210508 },
 };
 const size_t num_mainnet_hard_forks = sizeof(mainnet_hard_forks) / sizeof(mainnet_hard_forks[0]);