diff --git a/README.md b/README.md
index f0e27c6..30a9224 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,7 @@ pkg> test
 
 **Citing**:
 
-Ning, A., “Using Blade Element Momentum Methods with Gradient-Based Design Optimization,” Apr. 2020, (in review).
+Ning, A., “Using Blade Element Momentum Methods with Gradient-Based Design Optimization,” Structural and Multidisciplinary Optimization, Vol. 64, No. 2, pp. 994–1014, May 2021. doi:10.1007/s00158-021-02883-6
 
 **Python / OpenMDAO users**