diff --git a/test/BetaSchedules.jl b/test/BetaSchedules.jl
index 82dc8d1..e87de92 100644
--- a/test/BetaSchedules.jl
+++ b/test/BetaSchedules.jl
@@ -2,7 +2,7 @@ using Diffusers.BetaSchedules
 using Test
 
 @testset "Variance schedules tests" begin
-  @testset "β increases monotonically" begin
+  @testset "SNR decreases monotonically" begin
     T = 1000
 
     β_linear = linear_beta_schedule(T)
@@ -10,9 +10,20 @@ using Test
     β_cosine = cosine_beta_schedule(T)
     β_sigmoid = sigmoid_beta_schedule(T)
 
-    @test all(diff(β_linear) .>= 0)
-    @test all(diff(β_scaled_linear) .>= 0)
-    @test all(diff(β_cosine) .>= 0)
-    @test all(diff(β_sigmoid) .>= 0)
+    α̅_linear = cumprod(1 .- β_linear)
+    α̅_scaled_linear = cumprod(1 .- β_scaled_linear)
+    α̅_cosine = cumprod(1 .- β_cosine)
+    α̅_sigmoid = cumprod(1 .- β_sigmoid)
+
+    # arxiv:2208.11970 (eq. 109)
+    SNR_linear = α̅_linear ./ (1 .- α̅_linear)
+    SNR_scaled_linear = α̅_scaled_linear ./ (1 .- α̅_scaled_linear)
+    SNR_cosine = α̅_cosine ./ (1 .- α̅_cosine)
+    SNR_sigmoid = α̅_sigmoid ./ (1 .- α̅_sigmoid)
+
+    @test all(diff(SNR_linear) .<= 0)
+    @test all(diff(SNR_scaled_linear) .<= 0)
+    @test all(diff(SNR_cosine) .<= 0)
+    @test all(diff(SNR_sigmoid) .<= 0)
   end
 end