diff --git a/pyproject.toml b/pyproject.toml
index f7dfe35..67a3bd3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,7 +46,7 @@ dev_template = "{tag}"
 dirty_template = "{tag}"
 
 [tool.setuptools.packages.find]
-where = ["diffpy"]  # list of folders that contain the packages (["."] by default)
+where = ["src"]  # list of folders that contain the packages (["."] by default)
 include = ["*"]  # package names should match these glob patterns (["*"] by default)
 exclude = []  # exclude packages matching these glob patterns (empty by default)
 namespaces = false  # to disable scanning PEP 420 namespaces (true by default)
diff --git a/diffpy/__init__.py b/src/diffpy/__init__.py
similarity index 100%
rename from diffpy/__init__.py
rename to src/diffpy/__init__.py
diff --git a/diffpy/confutils/__init__.py b/src/diffpy/confutils/__init__.py
similarity index 100%
rename from diffpy/confutils/__init__.py
rename to src/diffpy/confutils/__init__.py
diff --git a/diffpy/confutils/config.py b/src/diffpy/confutils/config.py
similarity index 100%
rename from diffpy/confutils/config.py
rename to src/diffpy/confutils/config.py
diff --git a/diffpy/confutils/tools.py b/src/diffpy/confutils/tools.py
similarity index 100%
rename from diffpy/confutils/tools.py
rename to src/diffpy/confutils/tools.py
diff --git a/diffpy/confutils/version.py b/src/diffpy/confutils/version.py
similarity index 100%
rename from diffpy/confutils/version.py
rename to src/diffpy/confutils/version.py
diff --git a/diffpy/srxplanar/__init__.py b/src/diffpy/srxplanar/__init__.py
similarity index 100%
rename from diffpy/srxplanar/__init__.py
rename to src/diffpy/srxplanar/__init__.py
diff --git a/diffpy/srxplanar/calculate.py b/src/diffpy/srxplanar/calculate.py
similarity index 100%
rename from diffpy/srxplanar/calculate.py
rename to src/diffpy/srxplanar/calculate.py
diff --git a/diffpy/srxplanar/loadimage.py b/src/diffpy/srxplanar/loadimage.py
similarity index 100%
rename from diffpy/srxplanar/loadimage.py
rename to src/diffpy/srxplanar/loadimage.py
diff --git a/diffpy/srxplanar/mask.py b/src/diffpy/srxplanar/mask.py
similarity index 100%
rename from diffpy/srxplanar/mask.py
rename to src/diffpy/srxplanar/mask.py
diff --git a/diffpy/srxplanar/saveresults.py b/src/diffpy/srxplanar/saveresults.py
similarity index 100%
rename from diffpy/srxplanar/saveresults.py
rename to src/diffpy/srxplanar/saveresults.py
diff --git a/diffpy/srxplanar/selfcalibrate.py b/src/diffpy/srxplanar/selfcalibrate.py
similarity index 100%
rename from diffpy/srxplanar/selfcalibrate.py
rename to src/diffpy/srxplanar/selfcalibrate.py
diff --git a/diffpy/srxplanar/srxplanar.py b/src/diffpy/srxplanar/srxplanar.py
similarity index 100%
rename from diffpy/srxplanar/srxplanar.py
rename to src/diffpy/srxplanar/srxplanar.py
diff --git a/diffpy/srxplanar/srxplanarconfig.py b/src/diffpy/srxplanar/srxplanarconfig.py
similarity index 100%
rename from diffpy/srxplanar/srxplanarconfig.py
rename to src/diffpy/srxplanar/srxplanarconfig.py
diff --git a/diffpy/srxplanar/tifffile.py b/src/diffpy/srxplanar/tifffile.py
similarity index 100%
rename from diffpy/srxplanar/tifffile.py
rename to src/diffpy/srxplanar/tifffile.py
diff --git a/diffpy/srxplanar/version.py b/src/diffpy/srxplanar/version.py
similarity index 100%
rename from diffpy/srxplanar/version.py
rename to src/diffpy/srxplanar/version.py