diff --git a/ostream.cpp b/ostream.cpp
index 0df127c..f51861d 100644
--- a/ostream.cpp
+++ b/ostream.cpp
@@ -24,6 +24,22 @@
 #include <cruft/util/iterator.hpp>
 
 
+///////////////////////////////////////////////////////////////////////////////
+std::ostream&
+operator<< (std::ostream &os, VkExtent2D val)
+{
+    return os << "[ " << val.width << ", " << val.height << " ]";
+}
+
+
+//-----------------------------------------------------------------------------
+std::ostream&
+operator<< (std::ostream &os, VkExtent3D val)
+{
+    return os << "[ " << val.width << ", " << val.height << ", " << val.depth << "]";
+}
+
+
 ///////////////////////////////////////////////////////////////////////////////
 static
 std::ostream&
@@ -129,8 +145,26 @@ cruft::vk::operator<< (std::ostream &os, const physical_device &d)
     os << " ], ";
 
     os << " properties: " << d.properties ()
-       << ", features: " << d.features ()
-       << " }";
+       << ", features: " << d.features ();
 
-    return os;
-}
\ No newline at end of file
+    os << ", queues: ";
+    const auto &queues = d.queue_families ();
+    std::copy (
+        std::cbegin (queues),
+        std::cend (queues),
+        util::infix_iterator<VkQueueFamilyProperties> (os, ", ")
+    );
+
+    return os << "}";
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+std::ostream&
+operator<< (std::ostream &os, const VkQueueFamilyProperties &val)
+{
+    return os << "{ flags: "       << val.queueFlags
+              << ", count: "       << val.queueCount
+              << ", granularity: " << val.minImageTransferGranularity
+              << " }";
+};
diff --git a/ostream.hpp b/ostream.hpp
index fff9348..f86b568 100644
--- a/ostream.hpp
+++ b/ostream.hpp
@@ -27,7 +27,13 @@
 
 
 ///////////////////////////////////////////////////////////////////////////////
+std::ostream& operator<< (std::ostream&, VkExtent2D);
+std::ostream& operator<< (std::ostream&, VkExtent3D);
 std::ostream& operator<< (std::ostream&, VkPhysicalDeviceType);
+
+
+///////////////////////////////////////////////////////////////////////////////
+std::ostream& operator<< (std::ostream&, const VkQueueFamilyProperties&);
 std::ostream& operator<< (std::ostream&, const VkPhysicalDeviceLimits&);
 std::ostream& operator<< (std::ostream&, const VkPhysicalDeviceProperties&);