diff --git a/IkiWiki.pm b/IkiWiki.pm
index a2b9a3e24..2f274f384 100644
--- a/IkiWiki.pm
+++ b/IkiWiki.pm
@@ -252,7 +252,29 @@ sub getsetup () { #{{{
 		safe => 0, # paranoia
 		rebuild => 0,
 	},
-
+	umask => {
+		type => "integer",
+		description => "",
+		example => "022",
+		description => "force ikiwiki to use a particular umask",
+		safe => 0, # paranoia
+		rebuild => 0,
+	},
+	libdir => {
+		type => "string",
+		default => "",
+		example => "$ENV{HOME}/.ikiwiki/",
+		description => "extra library and plugin directory",
+		safe => 0, # directory
+		rebuild => 0,
+	},
+	ENV => {
+		type => "string", 
+		default => {},
+		description => "environment variables",
+		safe => 0, # paranoia
+		rebuild => 0,
+	},
 	exclude => {
 		type => "string",
 		default => undef,
@@ -342,14 +364,6 @@ sub getsetup () { #{{{
 		safe => 0,
 		rebuild => 0,
 	},
-	libdir => {
-		type => "internal",
-		default => undef,
-		example => "$ENV{HOME}/.ikiwiki/",
-		description => "extra library and plugin directory",
-		safe => 0,
-		rebuild => 0,
-	},
 } #}}}
 
 sub defaultconfig () { #{{{
@@ -408,7 +422,7 @@ sub checkconfig () { #{{{
 		require IkiWiki::Rcs::Stub;
 	}
 
-	if (exists $config{umask}) {
+	if (defined $config{umask}) {
 		umask(possibly_foolish_untaint($config{umask}));
 	}
 
diff --git a/IkiWiki/Plugin/amazon_s3.pm b/IkiWiki/Plugin/amazon_s3.pm
index 9cb74fb1e..d9279b680 100644
--- a/IkiWiki/Plugin/amazon_s3.pm
+++ b/IkiWiki/Plugin/amazon_s3.pm
@@ -44,21 +44,20 @@ sub getsetup () { #{{{
 	return
 		 amazon_s3_key_id => {
 			type => "string",
-			default => "",
+			example => "XXXXXXXXXXXXXXXXXXXX",
 			description => "public access key id",
 			safe => 1,
 			rebuild => 0,
 		},
 		amazon_s3_key_id => {
 			type => "string",
-			default => "",
-			description => "file holding secret key",
+			example => "$ENV{HOME}/.s3_key",
+			description => "file holding secret key (must not be readable by others!)",
 			safe => 0, # ikiwiki reads this file
 			rebuild => 0,
 		},
 		amazon_s3_bucket => {
 			type => "string",
-			default => "",
 			example => "mywiki",
 			description => "globally unique name of bucket to store wiki in",
 			safe => 1,
@@ -66,14 +65,13 @@ sub getsetup () { #{{{
 		},
 		amazon_s3_prefix => {
 			type => "string",
-			default => "wiki/",
+			example => "wiki/",
 			description => "a prefix to prepend to each page name",
 			safe => 1,
 			rebuild => 1,
 		},
 		amazon_s3_location => {
 			type => "string",
-			default => "",
 			example => "EU",
 			description => "which S3 datacenter to use (leave blank for default)",
 			safe => 1,
@@ -82,7 +80,7 @@ sub getsetup () { #{{{
 		amazon_s3_dupindex => {
 			type => "boolean",
 			default => 0,
-			description => "store each index file twice? (to allow urls ending in \"/index.html\" and \"/\")",
+			description => "store each index file twice? (allows urls ending in \"/index.html\" and \"/\")",
 			safe => 1,
 			rebuild => 1,
 		},
diff --git a/IkiWiki/Plugin/anonok.pm b/IkiWiki/Plugin/anonok.pm
index e61549986..7b966f845 100644
--- a/IkiWiki/Plugin/anonok.pm
+++ b/IkiWiki/Plugin/anonok.pm
@@ -14,9 +14,8 @@ sub getsetup () { #{{{
 	return
 		anonok_pagespec => {
 			type => "string",
-			default => "",
 			example => "*/discussion",
-			description => "PageSpec to limit which pages anonymouse users can edit",
+			description => "PageSpec to limit which pages anonymous users can edit",
 			safe => 1,
 			rebuild => 0,
 		},
diff --git a/IkiWiki/Plugin/attachment.pm b/IkiWiki/Plugin/attachment.pm
index 3fe33c858..6f707832d 100644
--- a/IkiWiki/Plugin/attachment.pm
+++ b/IkiWiki/Plugin/attachment.pm
@@ -14,7 +14,7 @@ sub import { #{{{
 
 sub getsetup () { #{{{
 	return
-		 => {
+		virus_checker => {
 			type => "string",
 			default => "",
 			example => "clamdscan -",
diff --git a/IkiWiki/Plugin/mirrorlist.pm b/IkiWiki/Plugin/mirrorlist.pm
index c7630d81f..eb273561d 100644
--- a/IkiWiki/Plugin/mirrorlist.pm
+++ b/IkiWiki/Plugin/mirrorlist.pm
@@ -14,7 +14,7 @@ sub getsetup () { #{{{
 	return
 		mirrorlist => {
 			type => "string",
-			default => "",
+			default => {},
 			description => "list of mirrors",
 			safe => 1,
 			rebuild => 1,