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Co-authored-by: Rootul P <rootulp@gmail.com>

specs/src/specs/data_square_layout.md

@@ -11,8 +11,8 @@ Celestia uses [a data availability scheme](https://arxiv.org/abs/1809.09044) tha
 Block data consists of:
 
 1. Standard cosmos-SDK transactions: (which are often represented internally as the [`sdk.Tx` interface](https://github.com/celestiaorg/cosmos-sdk/blob/v1.14.0-sdk-v0.46.11/types/tx_msg.go#L42-L50)) as described in [cosmos-sdk ADR020](https://github.com/celestiaorg/cosmos-sdk/blob/v1.14.0-sdk-v0.46.11/docs/architecture/adr-020-protobuf-transaction-encoding.md)
-    1. These transactions contain protobuf encoded [`sdk.Msg`](https://github.com/celestiaorg/cosmos-sdk/blob/v1.14.0-sdk-v0.46.11/types/tx_msg.go#L14-L26)s, which get executed atomically (if one fails they all fail) to update the Celestia state. The complete list of modules, which define the `sdk.Msg`s that the state machine is capable of handling, can be found in the [state machine modules spec](../specs/state_machine_modules.md). Examples include standard cosmos-sdk module messages such as [MsgSend](https://github.com/cosmos/cosmos-sdk/blob/f71df80e93bffbf7ce5fbd519c6154a2ee9f991b/proto/cosmos/bank/v1beta1/tx.proto#L21-L32)), and celestia specific module messages such as [`MsgPayForBlob`](https://github.com/celestiaorg/celestia-app/blob/v1.0.0-rc2/proto/celestia/blob/v1/tx.proto#L16-L31)
-1. Blobs: binary blobs which do not modify the Celestia state, but which are intended for a Celestia application identified with a provided namespace.
+    1. These transactions contain protobuf encoded [`sdk.Msg`](https://github.com/celestiaorg/cosmos-sdk/blob/v1.14.0-sdk-v0.46.11/types/tx_msg.go#L14-L26)s, which get executed atomically (if one fails they all fail) to update the Celestia state. The complete list of modules, which define the `sdk.Msg`s that the state machine is capable of handling, can be found in the [state machine modules spec](../specs/state_machine_modules.md). Examples include standard cosmos-sdk module messages such as [MsgSend](https://github.com/cosmos/cosmos-sdk/blob/f71df80e93bffbf7ce5fbd519c6154a2ee9f991b/proto/cosmos/bank/v1beta1/tx.proto#L21-L32)), and celestia specific module messages such as [`MsgPayForBlobs`](https://github.com/celestiaorg/celestia-app/blob/v1.0.0-rc2/proto/celestia/blob/v1/tx.proto#L16-L31)
+1. Blobs: binary large objects which do not modify the Celestia state, but which are intended for a Celestia application identified with a provided namespace.
 
 We want to arrange this data into a `k * k` matrix of fixed-sized [shares](../specs/shares.md), which will later be committed to in [Namespace Merkle Trees (NMTs)](https://github.com/celestiaorg/nmt/blob/v0.16.0/docs/spec/nmt.md) so that individual shares in this matrix can be proven to belong to a single data root.
 
@@ -36,16 +36,16 @@ Specifically, blobs must begin at a new share. We note a nice property from this
 
 This, however, requires the block producer to interact with the transaction sender to provide them the starting location of their blob, so that the sender can sign over the commitment based on that starting location. This can be done selectively, but is not ideal as a default for e.g. end-user wallets.
 
-### Non-Interaction Rules
+### Blob Share Commitment Rules
 
-We impose one additional rule on blob placement to make the possible starting locations of blobs sufficiently predictable and constrained such that users can deterministically compute subtree roots without the need to interact with the block proposer:
+To make the possible starting locations of blobs sufficiently predictable and constrained such that users can deterministically compute subtree roots, needed for the `ShareCommitment`s within a PFB, without the need to interact with the block proposer, we impose one additional rule:
 
 > Blobs must start at an index that is a multiple of the `SubtreeWidth`. The `SubtreeWidth` is the length of the blob in shares, divided by the [`SubtreeRootThreshold`](https://github.com/celestiaorg/celestia-app/blob/v1.0.0-rc2/pkg/appconsts/v1/app_consts.go#L6) and rounded up to the nearest power of 2 ([implementation here](https://github.com/celestiaorg/celestia-app/blob/v1.0.0-rc2/pkg/shares/non_interactive_defaults.go#L94-L116)).
 
-The `SubtreeRootThreshold` is an arbitrary versioned protocol constant that aims to put a soft limit the number of subtree roots included in a blob inclusion proof, as described in [ADR013](../../../docs/architecture/adr-013-non-interactive-default-rules-for-zero-padding.md).
+The `SubtreeRootThreshold` is an arbitrary versioned protocol constant that aims to put a soft limit on the number of subtree roots included in a blob inclusion proof, as described in [ADR013](../../../docs/architecture/adr-013-non-interactive-default-rules-for-zero-padding.md). A higher `SubtreeRootThreshold` means less padding and more tightly packed squares but also means greater proof sizes.
 
 In the constraint mentioned above, the number of rows/columns in the minimum square size should be a power of 2.
-With the above constraint, we can compute subtree roots deterministically. For example, a blob of 128 shares and SRT = 64, must start on a share index that is a multiple of 2 because 128/64 = 2. In this case, there will be a maximum of 1 share of padding between blobs (more on padding below). The maximum subtree width in shares will also be 2, meaning that there will be 2 shares under each subtree root.
+With the above constraint, we can compute subtree roots deterministically. For example, a blob of 128 shares and `SubtreeRootThreshold` (SRT) = 64, must start on a share index that is a multiple of 2 because 128/64 = 2. In this case, there will be a maximum of 1 share of padding between blobs (more on padding below). The maximum subtree width in shares will also be 2, meaning that there will be 2 shares under each subtree root.
 
 The last piece of the puzzle is determining _which_ row the blob is placed at (or, more specifically, the starting location). This is needed to keep the block producer accountable. To this end, the block producer simply augments each fee-paying transaction with the starting locations of the blobs the transaction pays for.