diff --git a/pyproject.toml b/pyproject.toml
index 98ecee8..39117f1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name =  "opcsim"
-version = "1.1.0a1"
+version = "1.1.0a2"
 license = "MIT"
 description = "OPCSIM: simulating low-cost optical particle counters"
 authors = ["David H Hagan <david.hagan@quant-aq.com>", "Jesse H Kroll <jhkroll@mit.edu>"]
@@ -11,7 +11,7 @@ repository = "https://github.com/dhhagan/opcsim"
 documentation = "https://dhhagan.github.io/opcsim/"
 keywords = ["aerosols", "atmospheric chemistry"]
 packages = [
-    { include = "opcsim" },
+    { include = "opcsim", from="src" },
 ]
 
 [tool.poetry.dependencies]
diff --git a/opcsim/__init__.py b/src/opcsim/__init__.py
similarity index 100%
rename from opcsim/__init__.py
rename to src/opcsim/__init__.py
diff --git a/opcsim/distributions.py b/src/opcsim/distributions.py
similarity index 100%
rename from opcsim/distributions.py
rename to src/opcsim/distributions.py
diff --git a/opcsim/equations/__init__.py b/src/opcsim/equations/__init__.py
similarity index 100%
rename from opcsim/equations/__init__.py
rename to src/opcsim/equations/__init__.py
diff --git a/opcsim/equations/cdf.py b/src/opcsim/equations/cdf.py
similarity index 100%
rename from opcsim/equations/cdf.py
rename to src/opcsim/equations/cdf.py
diff --git a/opcsim/equations/pdf.py b/src/opcsim/equations/pdf.py
similarity index 100%
rename from opcsim/equations/pdf.py
rename to src/opcsim/equations/pdf.py
diff --git a/opcsim/metrics.py b/src/opcsim/metrics.py
similarity index 100%
rename from opcsim/metrics.py
rename to src/opcsim/metrics.py
diff --git a/opcsim/mie.py b/src/opcsim/mie.py
similarity index 100%
rename from opcsim/mie.py
rename to src/opcsim/mie.py
diff --git a/opcsim/models.py b/src/opcsim/models.py
similarity index 100%
rename from opcsim/models.py
rename to src/opcsim/models.py
diff --git a/opcsim/plots.py b/src/opcsim/plots.py
similarity index 100%
rename from opcsim/plots.py
rename to src/opcsim/plots.py
diff --git a/opcsim/rc_style.py b/src/opcsim/rc_style.py
similarity index 100%
rename from opcsim/rc_style.py
rename to src/opcsim/rc_style.py
diff --git a/opcsim/utils.py b/src/opcsim/utils.py
similarity index 100%
rename from opcsim/utils.py
rename to src/opcsim/utils.py