diff --git a/docs/concept.rst b/docs/concept.rst
index 28c8ea877e39158831c2e7f4005c4ef00daaca88_ZG9jcy9jb25jZXB0LnJzdA==..3c5fe75653d423f8752237268ba2f9093c8f9825_ZG9jcy9jb25jZXB0LnJzdA== 100644
--- a/docs/concept.rst
+++ b/docs/concept.rst
@@ -18,6 +18,9 @@
 Inside each tarball is a data-env.poulpe file, which specifies the data source,
 metadata and arguments and transformations needed to setup for a benchmark.
 
+Data environments can define "data variables" who value will be used by the
+benchmarks.
+
 Binary Environment
 ------------------
 
@@ -30,7 +33,9 @@
 Benchmark
 ---------
 
-A `xxx.pdb` file that describe how to run a specific benchmark and its variant
+A `xxx.pdb` file that describe how to run a specific benchmark and its variant.
+
+The variable from the "data-envs" can be used to configure the benchmark.
 
 Running benchmarks
 ==================