diff --git a/src/lang/english.txt b/src/lang/english.txt
--- a/src/lang/english.txt
+++ b/src/lang/english.txt
@@ -2188,6 +2188,7 @@ STR_NETWORK_ERROR_TIMEOUT_PASSWORD      
 STR_NETWORK_ERROR_TIMEOUT_COMPUTER                              :{WHITE}Your computer is too slow to keep up with the server
 STR_NETWORK_ERROR_TIMEOUT_MAP                                   :{WHITE}Your computer took too long to download the map
 STR_NETWORK_ERROR_TIMEOUT_JOIN                                  :{WHITE}Your computer took too long to join the server
+STR_NETWORK_ERROR_INVALID_CLIENT_NAME                           :{WHITE}Your player name is not valid
 
 ############ Leave those lines in this order!!
 STR_NETWORK_ERROR_CLIENT_GENERAL                                :general error
@@ -2210,6 +2211,7 @@ STR_NETWORK_ERROR_CLIENT_TIMEOUT_PASSWOR
 STR_NETWORK_ERROR_CLIENT_TIMEOUT_COMPUTER                       :general timeout
 STR_NETWORK_ERROR_CLIENT_TIMEOUT_MAP                            :downloading map took too long
 STR_NETWORK_ERROR_CLIENT_TIMEOUT_JOIN                           :processing map took too long
+STR_NETWORK_ERROR_CLIENT_INVALID_CLIENT_NAME                    :invalid client name
 ############ End of leave-in-this-order
 
 STR_NETWORK_ERROR_CLIENT_GUI_LOST_CONNECTION_CAPTION            :{WHITE}Possible connection loss