diff --git a/README.md b/README.md
index 3f4d9d0..8533b2d 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
 # vapoursynth
 
-The vapoursynth package
\ No newline at end of file
+The vapoursynth package. The upstream project does not provide any versioning
+for the shared library, even with ABI changes. This package sets the library
+version to the upstream release version, to avoid having an unversioned shared
+object that might get updated by mistake.