diff --git a/.gitignore b/.gitignore
index ccb0c56..8d9cccd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,7 @@ out/
 output/
 bin/
 libs/
+doc_wiki/
 
 .classpath
 .project
diff --git a/common/build.gradle b/common/build.gradle
index d1929f3..fe521a2 100644
--- a/common/build.gradle
+++ b/common/build.gradle
@@ -60,4 +60,11 @@ publishing {
             }
         }
     }
+}
+
+tasks.register("genDoc", JavaExec) {
+    group = ApplicationPlugin.APPLICATION_GROUP
+    classpath = sourceSets.main.runtimeClasspath
+    mainClass = 'org.valkyrienskies.tournament.doc.DocumentedKt'
+    args = [rootDir.path]
 }
\ No newline at end of file
diff --git a/common/src/main/kotlin/org/valkyrienskies/tournament/blocks/BallastBlock.kt b/common/src/main/kotlin/org/valkyrienskies/tournament/blocks/BallastBlock.kt
index 85fca6e..1fdf58f 100644
--- a/common/src/main/kotlin/org/valkyrienskies/tournament/blocks/BallastBlock.kt
+++ b/common/src/main/kotlin/org/valkyrienskies/tournament/blocks/BallastBlock.kt
@@ -9,6 +9,9 @@ import net.minecraft.world.level.block.state.BlockState
 import net.minecraft.world.level.block.state.StateDefinition
 import net.minecraft.world.level.block.state.properties.BlockStateProperties.POWER
 import net.minecraft.world.level.material.Material
+import org.valkyrienskies.tournament.doc.Doc
+import org.valkyrienskies.tournament.doc.Documented
+import org.valkyrienskies.tournament.doc.documentation
 
 class BallastBlock : Block(
     Properties.of(Material.STONE)
@@ -50,4 +53,15 @@ class BallastBlock : Block(
         val signal = level.getBestNeighborSignal(pos)
         level.setBlock(pos, state.setValue(POWER, signal), 2)
     }
+
+    class DocImpl: Documented {
+        override fun getDoc() = documentation {
+            page("Ballast")
+                .kind(Doc.Kind.BLOCK)
+                .summary("A block that has a redstone adjustable weight")
+                .section("Usage") {
+                    content("Power with redstone to increase weight")
+                }
+        }
+    }
 }
diff --git a/common/src/main/kotlin/org/valkyrienskies/tournament/doc/Documented.kt b/common/src/main/kotlin/org/valkyrienskies/tournament/doc/Documented.kt
new file mode 100644
index 0000000..fd6d43a
--- /dev/null
+++ b/common/src/main/kotlin/org/valkyrienskies/tournament/doc/Documented.kt
@@ -0,0 +1,176 @@
+package org.valkyrienskies.tournament.doc
+
+import com.google.common.reflect.ClassPath
+import java.io.File
+import java.util.stream.Collectors
+
+data class Doc(
+    val kind: Kind,
+    val name: String,
+    val content: String,
+) {
+    enum class Kind(val path: String) {
+        NONE(""),
+
+        BLOCK("blocks/"),
+        ITEM("items/"),
+        CC_API("cc/"),
+        ADVANCEMENT("advancements/"),
+    }
+}
+
+interface Documented {
+    fun getDoc(): (DocumentationContext.Format) -> List<Doc>
+}
+
+class DocumentationContext {
+    private val pages = mutableListOf<Page>()
+
+    fun page(title: String): Page {
+        val page = Page(vtitle = title)
+        pages.add(page)
+        return page
+    }
+
+    class Page(
+        internal var vtitle: String,
+        internal var vkind: Doc.Kind = Doc.Kind.NONE,
+        internal var vdesc: MutableList<String> = mutableListOf(),
+        internal val vsection: MutableList<Section> = mutableListOf()
+    ) {
+        fun kind(kind: Doc.Kind): Page =
+            this.also { it.vkind = kind }
+
+        fun summary(str: String): Page =
+            this.also { it.vdesc += str}
+
+        fun section(name: String, fn: Section.() -> Unit): Page =
+            this.also {
+                val section = Section(name)
+                it.vsection.add(section)
+                fn(section)
+            }
+    }
+
+    data class Section(
+        internal var vtitle: String,
+        internal var vcontent: MutableList<Pair<String,ContentKind>> = mutableListOf(),
+    ) {
+        enum class ContentKind {
+            TEXT,
+            CODE,
+        }
+
+        fun content(str: String): Section =
+            this.also { it.vcontent += str to ContentKind.TEXT }
+
+        fun codeSnippet(str: String): Section =
+            this.also { it.vcontent += str to ContentKind.CODE }
+    }
+
+    enum class Format {
+        GH_MARKDOWN,
+        MEDIAWIKI,
+    }
+
+    internal fun build(fmt: Format): List<Doc> =
+        pages.map {
+            val sb = StringBuilder()
+
+            when (fmt) {
+                Format.MEDIAWIKI -> {
+                    sb.append("== ")
+                    sb.append(it.vtitle)
+                    sb.appendLine(" ==")
+                }
+                Format.GH_MARKDOWN -> {
+                    sb.append("# ")
+                    sb.appendLine(it.vtitle)
+                }
+            }
+
+            it.vdesc.forEachIndexed { index, s ->
+                if (index > 0)
+                    sb.appendLine()
+                sb.append(s)
+                sb.appendLine()
+            }
+
+            sb.appendLine()
+
+            it.vsection.forEach { section ->
+                when (fmt) {
+                    Format.MEDIAWIKI -> {
+                        sb.append("=== ")
+                        sb.append(section.vtitle)
+                        sb.appendLine(" ===")
+                    }
+                    Format.GH_MARKDOWN -> {
+                        sb.append("## ")
+                        sb.appendLine(section.vtitle)
+                    }
+                }
+
+                section.vcontent.forEachIndexed { index, (text,kind) ->
+                    if (index > 0)
+                        sb.appendLine()
+
+                    when (fmt) {
+                        Format.MEDIAWIKI -> when (kind) {
+                            Section.ContentKind.TEXT -> sb.append(text)
+                            Section.ContentKind.CODE -> {
+                                sb.append("<nowiki>")
+                                sb.append(text)
+                                sb.append("</nowiki>")
+                            }
+                        }
+                        Format.GH_MARKDOWN -> when (kind) {
+                            Section.ContentKind.TEXT -> sb.append(text)
+                            Section.ContentKind.CODE -> {
+                                sb.appendLine("```")
+                                sb.appendLine(text)
+                                sb.appendLine("```")
+                            }
+                        }
+                    }
+                }
+            }
+
+            Doc(it.vkind, it.vtitle, sb.toString())
+        }
+}
+
+fun documentation(fn: DocumentationContext.() -> Unit): (DocumentationContext.Format) -> List<Doc> {
+    val ctx = DocumentationContext()
+    fn(ctx)
+    return ctx::build
+}
+
+fun main(args: Array<String>) {
+    val outPath = args[0]
+
+    val classes = ClassPath.from(ClassLoader.getSystemClassLoader())
+        .getAllClasses()
+        .stream()
+        .filter { it.packageName.startsWith("org.valkyrienskies.tournament") }
+        .map { runCatching { it.load() } }
+        .filter { it.isSuccess }
+        .map { it.getOrThrow() }
+        .filter { Documented::class.java.isAssignableFrom(it) && it != Documented::class.java }
+        .map { it.getDeclaredConstructor().newInstance() as Documented }
+        .collect(Collectors.toSet())
+
+    fun format(outDir: String, fmt: DocumentationContext.Format) {
+        val doc = classes.flatMap { it.getDoc()(fmt) }
+        for (d in doc) {
+            val f = File(outPath + File.separator + outDir + File.separator + d.kind.path + d.name.replace(" ", "_").lowercase() + ".md ")
+            f.parentFile.mkdirs()
+            f.writeText(d.content)
+        }
+
+        println("Wrote ${doc.size} ${fmt.name.lowercase().replace('_', ' ')} documentation entries into ${outPath + File.separator + outDir}")
+    }
+
+    format("doc", DocumentationContext.Format.GH_MARKDOWN)
+    format("doc_wiki", DocumentationContext.Format.MEDIAWIKI)
+}
\ No newline at end of file