diff --git a/chia/types/condition_opcodes.py b/chia/types/condition_opcodes.py
index 3ac77e610f9f..d689a561fc93 100644
--- a/chia/types/condition_opcodes.py
+++ b/chia/types/condition_opcodes.py
@@ -55,6 +55,10 @@ class ConditionOpcode(bytes, enum.Enum):
     ASSERT_BEFORE_HEIGHT_RELATIVE = bytes([86])
     ASSERT_BEFORE_HEIGHT_ABSOLUTE = bytes([87])
 
+    # to be activated with the 2.0 hard fork.
+    # the first parameter is always the cost of the condition
+    SOFTFORK = bytes([90])
+
     # A condition that is always true and always ignore all arguments
     REMARK = bytes([1])
 
diff --git a/chia/util/errors.py b/chia/util/errors.py
index e9bf2c5c8488..c93e06cfa2f9 100644
--- a/chia/util/errors.py
+++ b/chia/util/errors.py
@@ -175,6 +175,15 @@ class Err(Enum):
 
     ASSERT_EPHEMERAL_FAILED = 140
     EPHEMERAL_RELATIVE_CONDITION = 141
+    # raised if a SOFTFORK condition invokes an unknown extension in mempool
+    # mode
+    INVALID_SOFTFORK_CONDITION = 142
+    # raised if the first argument to the SOFTFORK condition is not a valid
+    # cost. e.g. negative or > UINT64 MAX
+    INVALID_SOFTFORK_COST = 143
+    # raised if a spend issues too many assert spend, assert puzzle,
+    # assert announcement or create announcement
+    TOO_MANY_ANNOUNCEMENTS = 144
 
 
 class ValidationError(Exception):
diff --git a/chia/wallet/puzzles/condition_codes.clib b/chia/wallet/puzzles/condition_codes.clib
index ba4ff615b133..386036fb62a6 100644
--- a/chia/wallet/puzzles/condition_codes.clib
+++ b/chia/wallet/puzzles/condition_codes.clib
@@ -56,4 +56,8 @@
 
   ; A condition that is always true and always ignore all arguments
   (defconstant REMARK 1)
+
+  ; A condition whose first argument specifies its cost, but is unkown otherwise
+  ; It's a place-holder for soft-forking in new conditions
+  (defconstant SOFTFORK 90)
 )