diff --git a/specs/core/0_fork-choice.md b/specs/core/0_fork-choice.md
index a5d202ffa..e4ea773c8 100644
--- a/specs/core/0_fork-choice.md
+++ b/specs/core/0_fork-choice.md
@@ -61,6 +61,7 @@ The head block root associated with a `store` is defined as `get_head(store)`. A
 @dataclass
 class Target(object):
     epoch: Epoch
+    root: Bytes32
 ```
 
 #### `Store`
@@ -68,8 +69,12 @@ class Target(object):
 ```python
 @dataclass
 class Store(object):
+    blocks: Dict[Bytes32, BeaconBlock] = field(default_factory=dict)
+    states: Dict[Bytes32, BeaconState] = field(default_factory=dict)
     time: int = 0
     latest_targets: Dict[ValidatorIndex, Target] = field(default_factory=dict)
+    justified_root: Bytes32 = ZERO_HASH
+    finalized_root: Bytes32 = ZERO_HASH
 ```
 
 ### Helpers