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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -4,3 +4,5 @@ scapx: Selective Screen Capture for X environment
 # TODO
 
 # References
+- XCB Public API [Documentation](https://xcb.freedesktop.org/PublicApi)
+- The extensive comments in the corresponding xcb header files