diff --git a/crates/dmdoc/src/main.rs b/crates/dmdoc/src/main.rs
index 248ed948..65775eea 100644
--- a/crates/dmdoc/src/main.rs
+++ b/crates/dmdoc/src/main.rs
@@ -8,6 +8,7 @@ extern crate walkdir;
 mod markdown;
 mod template;
 
+use dm::ast::InputType;
 use dm::objtree::ObjectTree;
 use maud::{Markup, PreEscaped};
 use pulldown_cmark::{BrokenLink, CowStr};
@@ -404,6 +405,7 @@ fn main2() -> Result<(), Box<dyn std::error::Error>> {
                     params: proc_value.parameters.iter().map(|p| Param {
                         name: p.name.clone(),
                         type_path: format_type_path(&p.var_type.type_path),
+                        input_type: p.input_type,
                     }).collect(),
                     decl: match proc.declaration {
                         Some(ref decl) => decl.kind.name(),
@@ -1298,6 +1300,7 @@ struct Proc {
 struct Param {
     name: String,
     type_path: String,
+    input_type: Option<InputType>,
 }
 
 /// Module struct exposed to templates.
diff --git a/crates/dmdoc/src/template.rs b/crates/dmdoc/src/template.rs
index d6d3827f..734fd94f 100644
--- a/crates/dmdoc/src/template.rs
+++ b/crates/dmdoc/src/template.rs
@@ -2,6 +2,7 @@
 
 use std::path::Path;
 
+use dm::ast::InputType;
 use maud::{display, html, Markup, PreEscaped, Render, DOCTYPE};
 
 use crate::{markdown::DocBlock, Environment, Index, IndexTree, ModuleArgs, ModuleItem, Type};
@@ -443,6 +444,12 @@ pub(crate) fn dm_type(ty: &Type) -> Markup {
                                     "/"
                                 }
                                 (param.name)
+                                @if let Some(input_type) = param.input_type {
+                                    @if !input_type.is_empty() {
+                                        i { " as " }
+                                        (render_input_type(env, input_type))
+                                    }
+                                }
                             }
                             ") "
                             (git_link(env, &proc.file.to_string_lossy(), proc.line))
@@ -455,6 +462,48 @@ pub(crate) fn dm_type(ty: &Type) -> Markup {
     )
 }
 
+pub fn render_input_type(env: &Environment, input_type: InputType) -> Markup {
+    html! {
+        @for (i, &name) in matching_names(input_type).iter().enumerate() {
+            @if i > 0 { " | " }
+            @match name {
+                "mob" => (linkify_input_type(env, "mob", "/mob")),
+                "obj" => (linkify_input_type(env, "obj", "/obj")),
+                "turf" => (linkify_input_type(env, "turf", "/turf")),
+                "area" => (linkify_input_type(env, "area", "/area")),
+                //"icon" => (linkify_input_type(env, "icon", "/icon")),
+                //"sound" => (linkify_input_type(env, "sound", "/sound")),
+                "movable" => (linkify_input_type(env, "movable", "/atom/movable")),
+                "atom" => (linkify_input_type(env, "atom", "/atom")),
+                "list" => (linkify_input_type(env, "list", "/list")),
+                _ => (name),
+            }
+        }
+    }
+}
+
+fn linkify_input_type(env: &Environment, show: &str, typepath: &str) -> Markup {
+    if env.all_type_names.contains(typepath) {
+        html! {
+            a href=(format!("{}.html", &typepath[1..])) { (show) }
+        }
+    } else {
+        html! { (show) }
+    }
+}
+
+fn matching_names(mut input_type: InputType) -> Vec<&'static str> {
+    let mut result = Vec::with_capacity(input_type.bits().count_ones() as usize);
+    for &(name, value) in InputType::ENTRIES.iter().rev() {
+        if input_type.contains(value) {
+            input_type.remove(value);
+            result.push(name);
+        }
+    }
+    result.reverse();
+    result
+}
+
 pub fn save_resources(output_path: &Path) -> std::io::Result<()> {
     #[cfg(debug_assertions)]
     macro_rules! resources {
diff --git a/crates/dreammaker/src/ast.rs b/crates/dreammaker/src/ast.rs
index c338b561..bbdeca0c 100644
--- a/crates/dreammaker/src/ast.rs
+++ b/crates/dreammaker/src/ast.rs
@@ -456,6 +456,12 @@ macro_rules! type_table {
             }
         }
 
+        impl $name {
+            pub const ENTRIES: &'static [(&'static str, $name)] = &[
+                $(($txt, $name::$i),)*
+            ];
+        }
+
         impl std::str::FromStr for $name {
             type Err = ();