diff --git a/docs/templates.md b/docs/templates.md
index 6c44035d0..32da20510 100644
--- a/docs/templates.md
+++ b/docs/templates.md
@@ -72,13 +72,15 @@ right.
 
 Some template functions come from Go's standard library and are listed in the
 [Go documentation][]. In addition the functions declared by [sprig][] are
-available in kontemplate, as well as three custom functions:
+available in kontemplate, as well as five custom functions:
 
 * `json`: Encodes any supplied data structure as JSON.
 * `gitHEAD`: Retrieves the commit hash at Git `HEAD`.
 * `passLookup`: Looks up the supplied key in [pass][].
 * `insertFile`: Insert the contents of the given file in the resource
   set folder as a string.
+* `insertTemplate`: Insert the contents of the given template in the resource
+  set folder as a string.
 
 ## Examples:
 
diff --git a/templater/templater.go b/templater/templater.go
index e842daeba..55b64766c 100644
--- a/templater/templater.go
+++ b/templater/templater.go
@@ -205,6 +205,14 @@ func templateFuncs(c *context.Context, rs *context.ResourceSet) template.FuncMap
 
 		return string(data), nil
 	}
+	m["insertTemplate"] = func(file string) (string, error) {
+		data, err := templateFile(c, rs, path.Join(rs.Path, file))
+		if err != nil {
+			return "", err
+		}
+
+		return data.Rendered, nil
+	}
 	m["default"] = func(defaultVal interface{}, varName string) interface{} {
 		if val, ok := rs.Values[varName]; ok {
 			return val