diff --git a/go.mod b/go.mod
index 7b7a85b..92cb16e 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/bouncepaw/mycorrhiza
 go 1.19
 
 require (
-	git.sr.ht/~bouncepaw/mycomarkup/v5 v5.4.0
+	git.sr.ht/~bouncepaw/mycomarkup/v5 v5.5.0
 	github.com/go-ini/ini v1.63.2
 	github.com/gorilla/feeds v1.1.1
 	github.com/gorilla/mux v1.8.0
@@ -23,4 +23,4 @@ require (
 
 // Use this trick to test local Mycomarkup changes, replace the path with yours,
 // but do not commit the change to the path:
-// replace git.sr.ht/~bouncepaw/mycomarkup/v5 v5.4.0 => "/Users/bouncepaw/src/mycomarkup"
+// replace git.sr.ht/~bouncepaw/mycomarkup/v5 v5.5.0 => "/Users/bouncepaw/src/mycomarkup"
diff --git a/go.sum b/go.sum
index 5039e89..dccb748 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,5 @@
-git.sr.ht/~bouncepaw/mycomarkup/v5 v5.4.0 h1:n57ze2WEmtjhlDDDPKctp40rzo8T2bGfuR9s7UAOaVg=
-git.sr.ht/~bouncepaw/mycomarkup/v5 v5.4.0/go.mod h1:TCzFBqW11En4EjLfcQtJu8C/Ro7FIFR8vZ+nM9f6Q28=
+git.sr.ht/~bouncepaw/mycomarkup/v5 v5.5.0 h1:0Ycy67Leh4E7HGw/Z2xs/VEw6BH68QIpQdpXcJooX7w=
+git.sr.ht/~bouncepaw/mycomarkup/v5 v5.5.0/go.mod h1:TCzFBqW11En4EjLfcQtJu8C/Ro7FIFR8vZ+nM9f6Q28=
 github.com/andybalholm/brotli v1.0.2/go.mod h1:loMXtMfwqflxFJPmdbJO0a3KNoPuLBgiu3qAvBg8x/Y=
 github.com/andybalholm/brotli v1.0.3/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
diff --git a/interwiki/view_interwiki.html b/interwiki/view_interwiki.html
index 12d8159..f4b57a5 100644
--- a/interwiki/view_interwiki.html
+++ b/interwiki/view_interwiki.html
@@ -70,7 +70,8 @@
 					<label for="engine{{$i}}" class="required-field">{{template "engine"}}</label>
 					<select name="engine" id="engine{{$i}}" required>
 						<option value="mycorrhiza" {{if eq .Engine "mycorrhiza"}}selected{{end}}>{{template "engine/mycorrhiza"}} 🍄</option>
-						<option value="agora" {{if eq .Engine "agora"}}selected{{end}}>Agora ἀ</option>
+						<option value="betula" {{if eq .Engine "betula"}}selected{{end}}>{{template "engine/betula"}} 🌳</option>
+						<option value="agora" {{if eq .Engine "agora"}}selected{{end}}>{{template "engine/agora"}} ἀ</option>
 						<option value="generic" {{if eq .Engine "generic"}}selected{{end}}>{{template "engine/generic"}}</option>
 					</select>
 				</p>
@@ -109,7 +110,8 @@
 			<label for="engine" class="required-field">{{template "engine"}}</label>
 			<select name="engine" id="engine" required>
 				<option value="mycorrhiza">{{template "engine/mycorrhiza"}} 🍄</option>
-				<option value="agora">Agora ἀ</option>
+				<option value="betula">{{template "engine/betula"}} 🌳</option>
+				<option value="agora">{{template "engine/agora"}} ἀ</option>
 				<option value="generic">{{template "engine/generic"}}</option>
 			</select>
 		</p>
diff --git a/interwiki/view_name_taken.html b/interwiki/view_name_taken.html
index 40b55cf..f206285 100644
--- a/interwiki/view_name_taken.html
+++ b/interwiki/view_name_taken.html
@@ -22,6 +22,7 @@
 				<label for="engine" class="required-field">Engine:</label>
 				<select name="engine" id="engine" required>
 					<option value="mycorrhiza" {{if eq .Engine "mycorrhiza"}}selected{{end}}>Mycorrhiza 🍄</option>
+					<option value="betula" {{if eq .Engine "betula"}}selected{{end}}>Betula 🌳</option>
 					<option value="agora" {{if eq .Engine "agora"}}selected{{end}}>Agora ἀ</option>
 					<option value="generic" {{if eq .Engine "generic"}}selected{{end}}>Generic (any website)</option>
 				</select>
diff --git a/interwiki/web.go b/interwiki/web.go
index c69dae8..7e4f242 100644
--- a/interwiki/web.go
+++ b/interwiki/web.go
@@ -18,6 +18,8 @@ var (
 {{define "aliases (,)"}}Псевдонимы (разделённые запятыми):{{end}}
 {{define "engine"}}Движок:{{end}}
 	{{define "engine/mycorrhiza"}}Микориза{{end}}
+	{{define "engine/betula"}}Бетула{{end}}
+	{{define "engine/agora"}}Агора{{end}}
 	{{define "engine/generic"}}Любой сайт{{end}}
 {{define "link href format"}}Строка форматирования атрибута href ссылки:{{end}}
 {{define "img src format"}}Строка форматирования атрибута src изображения:{{end}}
diff --git a/interwiki/wiki.go b/interwiki/wiki.go
index 7ceed42..4d0ef51 100644
--- a/interwiki/wiki.go
+++ b/interwiki/wiki.go
@@ -11,6 +11,7 @@ type WikiEngine string
 
 const (
 	Mycorrhiza WikiEngine = "mycorrhiza"
+	Betula     WikiEngine = "betula"
 	Agora      WikiEngine = "agora"
 	// Generic is any website.
 	Generic WikiEngine = "generic"
@@ -18,7 +19,7 @@ const (
 
 func (we WikiEngine) Valid() bool {
 	switch we {
-	case Mycorrhiza, Agora, Generic:
+	case Mycorrhiza, Betula, Agora, Generic:
 		return true
 	}
 	return false
@@ -65,6 +66,8 @@ func (w *Wiki) canonize() {
 		switch w.Engine {
 		case Mycorrhiza:
 			w.LinkHrefFormat = fmt.Sprintf("%s/hypha/{NAME}", w.URL)
+		case Betula:
+			w.LinkHrefFormat = fmt.Sprintf("%s/{BETULA-NAME}", w.URL)
 		case Agora:
 			w.LinkHrefFormat = fmt.Sprintf("%s/node/{NAME}", w.URL)
 		default: