diff --git a/pyproject.toml b/pyproject.toml
index 4cbb5d0d543c0069de7f93060fc77c1df1c8e3eb..01cdab79e6a16554b79507fffcb580bb557e3fb2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,15 +21,15 @@ py-find-1st = "^1.1.5"
 scikit-image = ">=0.18.1"
 opencv-python = "*"
 requests-toolbelt = "^0.9.1"
-h5py = "2.10"
+h5py = "2.10" # I/O into files
 imageio = "2.8.0"
-omero-py = ">=5.6.2"
-zeroc-ice = "3.6.5"
+omero-py = ">=5.6.2" # contact omero server
+zeroc-ice = "3.6.5" # pin networking interface
 aliby-agora = "^0.2.28"
 aliby-baby = "^0.1.9"
 aliby-post = "^0.1.26"
-p-tqdm = "^1.3.3"
-xmltodict = "^0.13.0"
+p-tqdm = "^1.3.3" # Parallel progress bars
+xmltodict = "^0.13.0" # read ome-tiff metadata
 protobuf = "<=3.20.1" # For pytest to work