diff --git a/example/example12.cpp b/example/example12.cpp
index ab1b482..97ba6a8 100644
--- a/example/example12.cpp
+++ b/example/example12.cpp
@@ -50,9 +50,11 @@
 
     virtual bool run_bool() {
         PYBIND11_OVERLOAD_PURE(
-            bool,
-            Example12,
-            run_bool
+            bool,         /* Return type */
+            Example12,    /* Parent class */
+            run_bool,     /* Name of function */
+                          /* This function has no arguments. The trailing comma
+                             in the previous line is needed for some compilers */
         );
         throw std::runtime_error("this will never be reached");
     }
@@ -61,8 +63,9 @@
         PYBIND11_OVERLOAD_PURE(
             void,         /* Return type */
             Example12,    /* Parent class */
-            pure_virtual  /* Name of function */
-                          /* This function has no arguments */
+            pure_virtual, /* Name of function */
+                          /* This function has no arguments. The trailing comma
+                             in the previous line is needed for some compilers */
         );
     }
 };