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diff --git a/doc/errors.but b/doc/errors.but
index b3898ca4..2c4385e6 100644
--- a/doc/errors.but
+++ b/doc/errors.but
@@ -15,6 +15,8 @@ bug (see \k{feedback}) and we will add documentation for it.
 \H{errors-hostkey-absent} \q{The server's host key is not cached in
 the registry}
 
+\cfg{winhelp-topic}{errors.hostkey.absent}
+
 This error message occurs when PuTTY connects to a new SSH server.
 Every server identifies itself by means of a host key; once PuTTY
 knows the host key for a server, it will be able to detect if a
@@ -36,6 +38,8 @@ See \k{gs-hostkey} for more information on host keys.
 
 \H{errors-hostkey-wrong} \q{WARNING - POTENTIAL SECURITY BREACH!}
 
+\cfg{winhelp-topic}{errors.hostkey.changed}
+
 This message, followed by \q{The server's host key does not match
 the one PuTTY has cached in the registry}, means that PuTTY has
 connected to the SSH server before, knows what its host key
@@ -69,7 +73,8 @@ this, let us know and we'll move it up our priority list.
 ... below the configured warning threshold}
 
 This occurs when the SSH server does not offer any ciphers which you
-have configured PuTTY to consider strong enough.
+have configured PuTTY to consider strong enough. By default, PuTTY
+puts up this warning only for single-DES encryption.
 
 See \k{config-ssh-encryption} for more information on this message.
 
@@ -125,9 +130,11 @@ Similarly, any error message starting with \q{Assertion failed} is a
 bug in PuTTY. Please report it to us, and include the exact text
 from the error message box.
 
-\H{errors-key-wrong-format} \q{Unable to use this private key file},
+\H{errors-cant-load-key} \q{Unable to use this private key file},
 \q{Couldn't load private key}, \q{Key is of wrong type}
 
+\cfg{winhelp-topic}{errors.cantloadkey}
+
 Various forms of this error are printed in the PuTTY window, or
 written to the PuTTY Event Log (see \k{using-eventlog}) when trying
 public-key authentication, or given by Pageant when trying to load a
@@ -247,7 +254,7 @@ of \c{su} do it automatically.
 abort}
 
 This is a generic error produced by the Windows network code when it
-decides that your network connection is dead. For example, it might
+kills an established connection for some reason. For example, it might
 happen if you pull the network cable out of the back of an
 Ethernet-connected computer, or if Windows has any other similar
 reason to believe the entire network has become unreachable.
@@ -272,6 +279,10 @@ connection out. See \k{faq-idleout} in the FAQ for more details. You
 may be able to improve the situation by using keepalives; see
 \k{config-keepalive} for details on this.
 
+Note that Windows can produce this error in some circumstances without
+seeing a connection reset from the server, for instance if the
+connection to the network is lost.
+
 \H{errors-connrefused} \q{Network error: Connection refused}
 
 This error means that the network connection PuTTY tried to make to