Thread pools implementation.
diff --git a/auto/summary b/auto/summary
index b200906..1be975d 100644
--- a/auto/summary
+++ b/auto/summary
@@ -7,6 +7,10 @@
 echo "Configuration summary"
 
 
+if [ $USE_THREADS = YES ]; then
+    echo "  + using threads"
+fi
+
 if [ $USE_PCRE = DISABLED ]; then
     echo "  + PCRE library is disabled"