From a62f3f824cfef70db61816d513cae0102abf86aa Mon Sep 17 00:00:00 2001
From: Joshy Orndorff <admin@joshyorndorff.com>
Date: Thu, 11 Mar 2021 13:09:58 -0500
Subject: [PATCH 1/2] Add a memo field

---
 runtime/common/src/crowdloan.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/runtime/common/src/crowdloan.rs b/runtime/common/src/crowdloan.rs
index b68c51aa67c2..a7a73ee4540b 100644
--- a/runtime/common/src/crowdloan.rs
+++ b/runtime/common/src/crowdloan.rs
@@ -322,7 +322,8 @@ decl_module! {
 			origin,
 			#[compact] index: FundIndex,
 			#[compact] value: BalanceOf<T>,
-			signature: Option<MultiSignature>
+			signature: Option<MultiSignature>,
+			_memo: [u8; 32],
 		) {
 			let who = ensure_signed(origin)?;
 

From 14bdf801d149a74a6cff94d79e5da2d822e1b7fe Mon Sep 17 00:00:00 2001
From: Joshy Orndorff <admin@joshyorndorff.com>
Date: Mon, 15 Mar 2021 15:56:43 -0400
Subject: [PATCH 2/2] switch to Vec<u8>

---
 runtime/common/src/crowdloan.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/runtime/common/src/crowdloan.rs b/runtime/common/src/crowdloan.rs
index cc95cc88d4bd..317f60513fff 100644
--- a/runtime/common/src/crowdloan.rs
+++ b/runtime/common/src/crowdloan.rs
@@ -112,6 +112,9 @@ impl WeightInfo for TestWeightInfo {
 	fn on_initialize(_n: u32, ) -> Weight { 0 }
 }
 
+/// Maximum byte length of the memo attached to a contribution.
+const MAX_MEMO_LENGTH: usize = 64;
+
 pub trait Config: frame_system::Config {
 	type Event: From<Event<Self>> + Into<<Self as frame_system::Config>::Event>;
 
@@ -283,6 +286,8 @@ decl_error! {
 		NotReadyToDissolve,
 		/// Invalid signature.
 		InvalidSignature,
+		/// The memo attached to this contribution is too long.
+		MemoTooLong,
 	}
 }
 
@@ -354,11 +359,12 @@ decl_module! {
 			#[compact] index: ParaId,
 			#[compact] value: BalanceOf<T>,
 			signature: Option<MultiSignature>,
-			_memo: [u8; 32],
+			memo: Vec<u8>,
 		) {
 			let who = ensure_signed(origin)?;
 
 			ensure!(value >= T::MinContribution::get(), Error::<T>::ContributionTooSmall);
+			ensure!(memo.len() < MAX_MEMO_LENGTH, Error::<T>::MemoTooLong);
 			let mut fund = Self::funds(index).ok_or(Error::<T>::InvalidParaId)?;
 			fund.raised  = fund.raised.checked_add(&value).ok_or(Error::<T>::Overflow)?;
 			ensure!(fund.raised <= fund.cap, Error::<T>::CapExceeded);