Adding missing word (#736)

diff --git a/src/iperf3.1 b/src/iperf3.1
index 601ffca..673cf16 100644
--- a/src/iperf3.1
+++ b/src/iperf3.1
@@ -368,7 +368,7 @@
 .SS "Authentication - RSA Keypair"
-The authentication feature of requires an RSA public keypair.
+The authentication feature of iperf3 requires an RSA public keypair.
 The public key is used to encrypt the authentication token containing the 
 user credentials, while the private key is used to decrypt the authentication token.
 An example of a set of UNIX/Linux commands to generate correct keypair follows: