diff --git a/polkadot/runtime/common/src/claims.rs b/polkadot/runtime/common/src/claims.rs
index a81117eb3c..334d5ec4bb 100644
--- a/polkadot/runtime/common/src/claims.rs
+++ b/polkadot/runtime/common/src/claims.rs
@@ -132,7 +132,7 @@ decl_event!(
 		Balance = BalanceOf<T>,
 		AccountId = <T as frame_system::Trait>::AccountId
 	{
-		/// Someone claimed some DOTs.
+		/// Someone claimed some DOTs. [who, ethereum_address, amount]
 		Claimed(AccountId, EthereumAddress, Balance),
 	}
 );
diff --git a/polkadot/runtime/common/src/crowdfund.rs b/polkadot/runtime/common/src/crowdfund.rs
index 11b7f9af7e..17b78cbd71 100644
--- a/polkadot/runtime/common/src/crowdfund.rs
+++ b/polkadot/runtime/common/src/crowdfund.rs
@@ -187,12 +187,19 @@ decl_event! {
 		<T as frame_system::Trait>::AccountId,
 		Balance = BalanceOf<T>,
 	{
+		/// Create a new crowdfunding campaign. [fund_index]
 		Created(FundIndex),
+		/// Contributed to a crowd sale. [who, fund_index, amount]
 		Contributed(AccountId, FundIndex, Balance),
+		/// Withdrew full balance of a contributor. [who, fund_index, amount]
 		Withdrew(AccountId, FundIndex, Balance),
+		/// Fund is placed into retirement. [fund_index]
 		Retiring(FundIndex),
+		/// Fund is dissolved. [fund_index]
 		Dissolved(FundIndex),
+		/// The deploy data of the funded parachain is setted. [fund_index]
 		DeployDataFixed(FundIndex),
+		/// Onboarding process for a winning parachain fund is completed. [find_index, parachain_id]
 		Onboarded(FundIndex, ParaId),
 	}
 }
diff --git a/polkadot/runtime/common/src/purchase.rs b/polkadot/runtime/common/src/purchase.rs
index ff36013f55..8818649345 100644
--- a/polkadot/runtime/common/src/purchase.rs
+++ b/polkadot/runtime/common/src/purchase.rs
@@ -107,19 +107,19 @@ decl_event!(
 		Balance = BalanceOf<T>,
 		BlockNumber = <T as frame_system::Trait>::BlockNumber,
 	{
-		/// A new account was created
+		/// A [new] account was created.
 		AccountCreated(AccountId),
-		/// Someone's account validity was updated
+		/// Someone's account validity was updated. [who, validity]
 		ValidityUpdated(AccountId, AccountValidity),
-		/// Someone's purchase balance was updated. (Free, Locked)
+		/// Someone's purchase balance was updated. [who, free, locked]
 		BalanceUpdated(AccountId, Balance, Balance),
-		/// A payout was made to a purchaser.
+		/// A payout was made to a purchaser. [who, free, locked]
 		PaymentComplete(AccountId, Balance, Balance),
-		/// A new payment account was set.
+		/// A new payment account was set. [who]
 		PaymentAccountSet(AccountId),
 		/// A new statement was set.
 		StatementUpdated,
-		/// A new statement was set.
+		/// A new statement was set. [block_number]
 		UnlockBlockUpdated(BlockNumber),
 	}
 );
diff --git a/polkadot/runtime/common/src/slots.rs b/polkadot/runtime/common/src/slots.rs
index e42ba04b64..60bf8f8174 100644
--- a/polkadot/runtime/common/src/slots.rs
+++ b/polkadot/runtime/common/src/slots.rs
@@ -268,22 +268,25 @@ decl_event!(
 		ParaId = ParaId,
 		Balance = BalanceOf<T>,
 	{
-		/// A new lease period is beginning.
+		/// A new [lease_period] is beginning.
 		NewLeasePeriod(LeasePeriod),
 		/// An auction started. Provides its index and the block number where it will begin to
 		/// close and the first lease period of the quadruplet that is auctioned.
+		/// [auction_index, lease_period, ending]
 		AuctionStarted(AuctionIndex, LeasePeriod, BlockNumber),
-		/// An auction ended. All funds become unreserved.
+		/// An auction ended. All funds become unreserved. [auction_index]
 		AuctionClosed(AuctionIndex),
 		/// Someone won the right to deploy a parachain. Balance amount is deducted for deposit.
+		/// [bidder, range, parachain_id, amount]
 		WonDeploy(NewBidder<AccountId>, SlotRange, ParaId, Balance),
 		/// An existing parachain won the right to continue.
 		/// First balance is the extra amount reseved. Second is the total amount reserved.
+		/// [parachain_id, range, extra_reseved, total_amount]
 		WonRenewal(ParaId, SlotRange, Balance, Balance),
 		/// Funds were reserved for a winning bid. First balance is the extra amount reserved.
-		/// Second is the total.
+		/// Second is the total. [bidder, extra_reserved, total_amount]
 		Reserved(AccountId, Balance, Balance),
-		/// Funds were unreserved since bidder is no longer active.
+		/// Funds were unreserved since bidder is no longer active. [bidder, amount]
 		Unreserved(AccountId, Balance),
 	}
 );
diff --git a/polkadot/runtime/parachains/src/inclusion.rs b/polkadot/runtime/parachains/src/inclusion.rs
index 1e04c2a407..a22ca47389 100644
--- a/polkadot/runtime/parachains/src/inclusion.rs
+++ b/polkadot/runtime/parachains/src/inclusion.rs
@@ -154,11 +154,11 @@ decl_error! {
 
 decl_event! {
 	pub enum Event<T> where <T as frame_system::Trait>::Hash {
-		/// A candidate was backed.
+		/// A candidate was backed. [candidate, head_data]
 		CandidateBacked(CandidateReceipt<Hash>, HeadData),
-		/// A candidate was included.
+		/// A candidate was included. [candidate, head_data]
 		CandidateIncluded(CandidateReceipt<Hash>, HeadData),
-		/// A candidate timed out.
+		/// A candidate timed out. [candidate, head_data]
 		CandidateTimedOut(CandidateReceipt<Hash>, HeadData),
 	}
 }