diff --git a/Sources/DocCHTMLExporter/HTML/InlineContentHTML.swift b/Sources/DocCHTMLExporter/HTML/InlineContentHTML.swift
index 0e1a07f..7c3734f 100644
--- a/Sources/DocCHTMLExporter/HTML/InlineContentHTML.swift
+++ b/Sources/DocCHTMLExporter/HTML/InlineContentHTML.swift
@@ -25,7 +25,8 @@ extension DocCArchive.InlineContent {
         
       case .emphasis(let value):
         return "<em>" + value.generateHTML(in: ctx) + "</em>"
-        
+      case .strong(let value):
+        return "<strong>" + value.generateHTML(in: ctx) + "</strong>"
       case .reference(let identifier, let isActive,
                       _ /* let overridingTitle */,
                       _ /* let overridingTitleInlineContent */):
diff --git a/Sources/DocCHTMLExporter/Templates/CodeListing.swift b/Sources/DocCHTMLExporter/Templates/CodeListing.swift
index 0fe82be..0aa24a3 100644
--- a/Sources/DocCHTMLExporter/Templates/CodeListing.swift
+++ b/Sources/DocCHTMLExporter/Templates/CodeListing.swift
@@ -21,14 +21,14 @@ let CodeListingTemplate = Mustache(
 
 extension DZRenderingContext {
 
-  func renderCodeListing(syntax: String = "Swift", lines: [ String ]) -> String
+  func renderCodeListing(syntax: String? = "Swift", lines: [ String ]) -> String
   {
     struct Line {
       let line : Int
       let code : String
     }
     return templates.codeListing(
-      syntax: syntax,
+      syntax: syntax ?? "",
       lines: lines.enumerated().map { idx, code in
         Line(line: idx + 1, code: code)
       }