1 files changed, 13 insertions, 11 deletions
diff --git a/tools/doc/html.js b/tools/doc/html.js
index bc5d3167f7..10b04a1b98 100644
--- a/tools/doc/html.js
+++ b/tools/doc/html.js
@@ -316,17 +316,19 @@ var BSD_ONLY_SYSCALLS = new Set(['lchmod']);
 // Returns modified text, with such refs replace with HTML links, for example
 // '<a href="http://man7.org/linux/man-pages/man2/open.2.html">open(2)</a>'
 function linkManPages(text) {
-  return text.replace(/ ([a-z.]+)\((\d)\)/gm, function(match, name, number) {
-    // name consists of lowercase letters, number is a single digit
-    var displayAs = name + '(' + number + ')';
-    if (BSD_ONLY_SYSCALLS.has(name)) {
-      return ' <a href="https://www.freebsd.org/cgi/man.cgi?query=' + name +
-             '&sektion=' + number + '">' + displayAs + '</a>';
-    } else {
-      return ' <a href="http://man7.org/linux/man-pages/man' + number +
-             '/' + name + '.' + number + '.html">' + displayAs + '</a>';
-    }
-  });
+  return text.replace(
+    / ([a-z.]+)\((\d)([a-z]?)\)/gm,
+    (match, name, number, optionalCharacter) => {
+      // name consists of lowercase letters, number is a single digit
+      var displayAs = `${name}(${number}${optionalCharacter})`;
+      if (BSD_ONLY_SYSCALLS.has(name)) {
+        return ` <a href="https://www.freebsd.org/cgi/man.cgi?query=${name}` +
+          `&sektion=${number}">${displayAs}</a>`;
+      } else {
+        return ` <a href="http://man7.org/linux/man-pages/man${number}` +
+          `/${name}.${number}${optionalCharacter}.html">${displayAs}</a>`;
+      }
+    });
 }
 
 function linkJsTypeDocs(text) {