diff --git a/challenge-OT4-T1/readme.md b/challenge-OT4-T1/readme.md
index aea9ef62b..b5f2f6166 100644
--- a/challenge-OT4-T1/readme.md
+++ b/challenge-OT4-T1/readme.md
@@ -15,6 +15,7 @@
 - Make sure that your sender account can cover all upcoming transaction fees paid from the general balance. A transfer will fail if the transfer fee cannot be paid. Failed transfers do not add to the requested transactions of the challenge. See [list of current transfer fees](https://github.com/Concordium/Testnet4-Challenges/issues/75).
 - A transfer must go from a sender account to a different account that receives. In other words, do not send a transfer to the sender account.
 
+
 ## Mission
 - Use the concordium-client.
 - Send 100 simple transfers per hour. 
diff --git a/challenge-OT4-T2/readme.md b/challenge-OT4-T2/readme.md
index 96b35cff5..2499363f1 100644
--- a/challenge-OT4-T2/readme.md
+++ b/challenge-OT4-T2/readme.md
@@ -13,6 +13,7 @@
 - Create new or reuse identities (mobile wallet).
 - Create new or reuse accounts (mobile wallet or concordium-client).
 - Make sure that your sender account can cover all upcoming transaction fees paid from the general balance. A transfer will fail if the transfer fee cannot be paid. Failed transfers do not add to the requested transactions of the challenge. See [list of current transfer fees](https://github.com/Concordium/Testnet4-Challenges/issues/75).
+- A transfer must go from a sender account to a different account that receives. In other words, do not send a transfer to the sender account.
 
 ## Mission
 - Use the concordium-client.
diff --git a/challenge-OT4-T3/readme.md b/challenge-OT4-T3/readme.md
index 262b2a226..372f1e60e 100644
--- a/challenge-OT4-T3/readme.md
+++ b/challenge-OT4-T3/readme.md
@@ -13,6 +13,7 @@
 - Create new or reuse identities (mobile wallet).
 - Create new or reuse accounts (mobile wallet or concordium-client).
 - Make sure that your sender account can cover all upcoming transaction fees paid from the general balance. A transfer will fail if the transfer fee cannot be paid. Failed transfers do not add to the requested transactions of the challenge. See [list of current transfer fees](https://github.com/Concordium/Testnet4-Challenges/issues/75).
+- A transfer must go from a sender account to a different account that receives. In other words, do not send a transfer to the sender account.
 
 ## Mission
 - Use the concordium-client.
diff --git a/challenge-OT4-T4/readme.md b/challenge-OT4-T4/readme.md
index 7f5a3ea8a..6dc10ab4f 100644
--- a/challenge-OT4-T4/readme.md
+++ b/challenge-OT4-T4/readme.md
@@ -13,6 +13,7 @@
 - Create new or reuse identities (mobile wallet).
 - Create new or reuse accounts (mobile wallet or concordium-client).
 - Make sure that your sender account can cover all upcoming transaction fees paid from the general balance. A transfers will fail, if the transfer fee cannot be paid. Failed transfers do not add to the requested transaction of the challenge. See [list of current transfer fees](https://github.com/Concordium/Testnet4-Challenges/issues/75).
+- A transfer must go from a sender account to a different account that receives. In other words, do not send a transfer to the sender account.
 
 ## Mission
 - Use the concordium-client.