diff --git a/README.md b/README.md
index 97606c1..b2d3bef 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,23 @@ sudo make install
 sudo make installcheck
 ```
 
+## Verificarlo CI
+
+Since Verificarlo should not be a dependency of QMCkl, all Verificarlo
+functions are called only when the support is explicitely enabled (and ignored
+by the preprocessor otherwise). To enable vfc_ci support, the library should be
+configured with the following command :
+
+```
+QMCKL_DEVEL=1 ./configure --prefix=$PWD/_install \ --enable-silent-rules --enable-maintainer-mode --enable-vfc_ci --host=x86_64 \ CC="verificarlo-f" FC="verificarlo-f"
+```
+
+where CC and FC are set to verificarlo-f, and support is explicitely enabled
+with the --enable-vfc_ci flag. Configuring the library with the "standard"
+command will cause all calls to Verificarlo related functions to be ignored,
+and the library will be built as usual.
+
+
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