diff --git a/requirements.txt b/requirements.txt
index a6d8b92e..dfb5cd90 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,11 +7,14 @@ pycocotools
 tqdm
 Pillow
 
-# Tensorboard pip requirements -------------------------------------------------
+# Nvidia Apex (optional) for mixed precision training --------------------------
+# git clone https://github.com/NVIDIA/apex && cd apex && pip install -v --no-cache-dir --global-option="--cpp_ext" --global-option="--cuda_ext" . --user && cd .. && rm -rf apex
+
+# Tensorboard (optional) pip requirements --------------------------------------
 # tb-nightly
 # future
 
-# Equivalent conda commands ----------------------------------------------------
+# Conda commands (in place of pip) ---------------------------------------------
 # conda update -n base -c defaults conda
 # conda install -yc anaconda numpy opencv matplotlib tqdm pillow ipython future
 # conda install -yc conda-forge scikit-image pycocotools onnx tensorboard