diff --git a/doc/README.tests b/doc/README.tests
index e6a39ca2b..1279d755b 100644
--- a/doc/README.tests
+++ b/doc/README.tests
@@ -6,6 +6,7 @@ To make and run the tests. The results are summarized at the end.
 
 You need to have the following programs installed and in your PATH.
 * dig - from the bind-tools package. Used to send DNS queries.
+* wdiff - used for word-by-word comparisons.
 * splint (optional) - for lint test
 * doxygen (optional) - for doc completeness test
 * ldns-testns (optional) - from ldns examples. Used as DNS auth server.
diff --git a/doc/control_proto_spec.txt b/doc/control_proto_spec.txt
index f6d330e1a..67bbc915d 100644
--- a/doc/control_proto_spec.txt
+++ b/doc/control_proto_spec.txt
@@ -62,5 +62,4 @@ local_data <resource record string>
 	local_data_add www.example.com. IN A 192.0.2.2
 	if no local_zone exists for it; a transparent zone with the same
 	name as the data is created.
-
-
+Other commands in the unbound-control manual page.
diff --git a/doc/example.conf.in b/doc/example.conf.in
index a5d7ada06..4a0652278 100644
--- a/doc/example.conf.in
+++ b/doc/example.conf.in
@@ -344,7 +344,7 @@ server:
 	# val-bogus-ttl: 60
 
 	# The signature inception and expiration dates are allowed to be off
-	# by 10% of the lifetime of the signature from our local clock.
+	# by 10% of the signature lifetime (expir-incep) from our local clock.
 	# This leeway is capped with a minimum and a maximum.  In seconds.
 	# val-sig-skew-min: 3600
 	# val-sig-skew-max: 86400
diff --git a/doc/unbound.conf.5.in b/doc/unbound.conf.5.in
index 5cc9237de..efda17fe5 100644
--- a/doc/unbound.conf.5.in
+++ b/doc/unbound.conf.5.in
@@ -581,17 +581,19 @@ you are debugging signature inception and expiration.
 .TP
 .B val\-sig\-skew\-min: \fI<seconds>
 Minimum number of seconds of clock skew to apply to validated signatures.
-A value of 10% of the signature lifetime is used, capped by this setting.  
-Default is 3600 (1 hour) which allows for daylight savings differences.  
-Lower this value for more strict checking of short lived signatures.
+A value of 10% of the signature lifetime (expiration \- inception) is
+used, capped by this setting.  Default is 3600 (1 hour) which allows for
+daylight savings differences.  Lower this value for more strict checking
+of short lived signatures.
 .TP
 .B val\-sig\-skew\-max: \fI<seconds>
 Maximum number of seconds of clock skew to apply to validated signatures.
-A value of 10% of the signature lifetime is used, capped by this setting.  
-Default is 86400 (24 hours) which allows for timezone setting problems in 
-stable domains.  Setting both min and max very low disables the clock skew 
-allowances.  Setting both min and max very high makes the validator check
-the signature timestamps less strictly.
+A value of 10% of the signature lifetime (expiration \- inception)
+is used, capped by this setting.  Default is 86400 (24 hours) which
+allows for timezone setting problems in stable domains.  Setting both
+min and max very low disables the clock skew allowances.  Setting both
+min and max very high makes the validator check the signature timestamps
+less strictly.
 .TP
 .B val\-bogus\-ttl: \fI<number>
 The time to live for bogus data. This is data that has failed validation;