diff --git a/README.md b/README.md
index a441eba..42456ea 100644
--- a/README.md
+++ b/README.md
@@ -20,3 +20,4 @@ sphere (one must choose the two physical spin states to be
 1. [Visualizing Spin 1 systems on the Bloch sphere](notebooks/Visualize_spin1_on_bloch_sphere.ipynb)
 2. [NV negative simple fine structure term only, and Bloch sphere](notebooks/NVNegZFS.ipynb)
 3. [NV negative with static and applied MW fields for spin control](notebooks/NVNeg_full_H_Zeeman_splitting.ipynb)
+3. [NV Ensemble with static field and ODMR spectrum](notebooks/NVNeg_full_H_Zeeman_ESR_spectrum.ipynb)