diff --git a/readme b/readme
new file mode 100644
index 0000000..cdf17b7
--- /dev/null
+++ b/readme
@@ -0,0 +1,6 @@
+Another option would be -g -grecord-gcc-switches and search for DW_AT_producer.
+Sadly, this doesn't produce the wanted information with clang:
+	clang++: DW_AT_producer    : (indirect string, offset: 0x0): clang version 3.9.1 (tags/RELEASE_391/final)
+	g++: DW_AT_producer    : (indirect string, offset: 0x37): GNU C++ 4.9.4 -mtune=generic -march=x86-64 -g -O3 -frecord-gcc-switches -fstack-protector-strong
+
+Passing the CPPFLAGS and so on as -DMY_FLAGS=.... to the compiler call will not include some information set by the compiler itself (compare the parameters set in the Makefile with the printed output).