More debian packaging tweaks
diff --git a/Makefile b/Makefile
index f308b5f..a1745ac 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,7 @@
+# Note that -pthread is only included so that older Linux builds will be thread
+# safe.  We call malloc, and older Linux versions only linked in the thread-safe
+# malloc if -pthread is specified.
+
 #CFLAGS=-Wall -g -ansi -fPIC -pthread
 CFLAGS=-Wall -O2 -ansi -fPIC -pthread
 LIB_TAG=0.1.15