diff --git a/docs/protocol/simplex-chat.md b/docs/protocol/simplex-chat.md
index 71d5efcef7..e3d8e88ae0 100644
--- a/docs/protocol/simplex-chat.md
+++ b/docs/protocol/simplex-chat.md
@@ -10,7 +10,7 @@ Evgeny Poberezkin
 
 ## Abstract
 
-SimpleX Chat Protocol is a protocol used to by SimpleX Chat clients to exchange messages. This protocol relies on lower level SimpleX protocols - SimpleX Messaging Protocol (SMP) and SimpleX Messaging Agent protocol. SimpleX Chat Protocol describes the format of messages and the client operations that should be performed when receiving such messages.
+SimpleX Chat Protocol is a protocol used by SimpleX Chat clients to exchange messages. This protocol relies on lower level SimpleX protocols - SimpleX Messaging Protocol (SMP) and SimpleX Messaging Agent protocol. SimpleX Chat Protocol describes the format of messages and the client operations that should be performed when receiving such messages.
 
 ## Scope