diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,2 +1,13 @@
 # RevitSdkSamples
-Revit SDK Documentation and Samples
+
+Revit SDK Documentation and Samples.
+
+Initial commit from Revit SDK installed from REVIT_2020_SDK.msi, 367304704 bytes, Mar 28 10:40.
+
+The model RVT files and some other large sample files are omitted from this repository by adding the following lines to `.gitignore`:
+
+```
+*.rfa
+*.rvt
+*.swf
+```
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