--- /dev/null
+This directory contains the serialized ABI definitions for a typical build of
+the lttng-ust librairies. This information is extracted using libabigail
+(https://sourceware.org/libabigail/).
+
+The artefacts used to generate these were built with CFLAGS="-O0 -ggdb" and all
+optional configure switches enabled.
+
+You can compare the serialized ABI with a shared object to check for breaking
+changes. For example, here we compare an in-tree built version of
+liblttng-ust.so with the serialized ABI of stable-2.13 :
+
+ abidiff \
+ extras/abi/2.13/x86_64-pc-linux-gnu/liblttng-ust.so.1.xml \
+ src/lib/lttng-ust/.libs/liblttng-ust.so