diff --git a/src/x11.cc b/src/x11.cc
index 378509e3..5deacd52 100644
--- a/src/x11.cc
+++ b/src/x11.cc
@@ -676,10 +676,11 @@ static void init_window(lua::state &l __attribute__((unused)), bool own) {
     XClassHint classHint;
 
     // class_name must be a named local variable, so that c_str() remains
-    // valid until we call XmbSetWMProperties() or XSetClassHint. We use const_cast because,
-    // for whatever reason, res_name is not declared as const char *.
-    // XmbSetWMProperties hopefully doesn't modify the value (hell, even their
-    // own example app assigns a literal string constant to the field)
+    // valid until we call XmbSetWMProperties() or XSetClassHint. We use
+    // const_cast because, for whatever reason, res_name is not declared as
+    // const char *. XmbSetWMProperties hopefully doesn't modify the value
+    // (hell, even their own example app assigns a literal string constant to
+    // the field)
     const std::string &class_name = own_window_class.get(l);
 
     classHint.res_name = const_cast<char *>(class_name.c_str());