diff --git a/legacy/ephysics/README b/legacy/ephysics/README
index 9ac090ac59..3a6d866dc7 100644
--- a/legacy/ephysics/README
+++ b/legacy/ephysics/README
@@ -23,6 +23,9 @@ EPhysics is a library that manages Ecore, Evas and Bullet Physics into
 an easy to use way. It's a kind of wrapper, a glue, between these libraries.
 It's not intended to be a physics library (we already have many out there).
 
+WARNING: if you are building Bullet Physics instead of using a package,
+use cmake build option. Autotools seems to be unmaintained.
+
 ------------------------------------------------------------------------------
 
 COMPILING AND INSTALLING: