diff --git a/substrate/Cargo.toml b/substrate/Cargo.toml
index 684363c227..20a104b6a1 100644
--- a/substrate/Cargo.toml
+++ b/substrate/Cargo.toml
@@ -96,7 +96,6 @@ members = [
 	"srml/session",
 	"srml/staking",
 	"srml/staking/reward-curve",
-	"srml/staking/reward-curve/test",
 	"srml/sudo",
 	"srml/system",
 	"srml/timestamp",
diff --git a/substrate/srml/staking/reward-curve/Cargo.toml b/substrate/srml/staking/reward-curve/Cargo.toml
index 4e254e9512..19deeae72e 100644
--- a/substrate/srml/staking/reward-curve/Cargo.toml
+++ b/substrate/srml/staking/reward-curve/Cargo.toml
@@ -8,7 +8,6 @@ edition = "2018"
 proc-macro = true
 
 [dependencies]
-# sr-api-macros = { path = "../../../core/sr-api-macros" }
 syn = { version = "1.0", features = [ "full", "visit" ] }
 quote = "1.0"
 proc-macro2 = "1.0"
diff --git a/substrate/srml/staking/reward-curve/src/lib.rs b/substrate/srml/staking/reward-curve/src/lib.rs
index 9ed319be7f..637ba10b9e 100644
--- a/substrate/srml/staking/reward-curve/src/lib.rs
+++ b/substrate/srml/staking/reward-curve/src/lib.rs
@@ -279,6 +279,8 @@ fn compute_points(input: &INposInput) -> Vec<(u32, u32)> {
 	let mut delta_y = max_length;
 	let mut y = input.max_inflation;
 
+	// The algorithm divide the curve in segment with vertical len and horizontal len less
+	// than `max_length`. This is not very accurate in case of very consequent steep.
 	while delta_y != 0 {
 		let next_y = y - delta_y;
 
diff --git a/substrate/srml/staking/reward-curve/test/Cargo.toml b/substrate/srml/staking/reward-curve/test/Cargo.toml
deleted file mode 100644
index 5c9ffb3cf7..0000000000
--- a/substrate/srml/staking/reward-curve/test/Cargo.toml
+++ /dev/null
@@ -1,9 +0,0 @@
-[package]
-name = "srml-staking-reward-curve-test"
-version = "2.0.0"
-authors = ["Parity Technologies <admin@parity.io>"]
-edition = "2018"
-
-[dependencies]
-srml-staking-reward-curve = { path = ".." }
-sr-primitives = { path = "../../../../core/sr-primitives" }
diff --git a/substrate/srml/staking/reward-curve/test/src/lib.rs b/substrate/srml/staking/reward-curve/tests/test.rs
similarity index 100%
rename from substrate/srml/staking/reward-curve/test/src/lib.rs
rename to substrate/srml/staking/reward-curve/tests/test.rs