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diff --git a/README.md b/README.md
index 78c6bcf..496cb31 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@ This repository contains codes for:
 
 * `expvc`: Explosion entity velocity and damage calculator.
 
+* `expexc`: Explosion entity exposure ray casting simulator.
+
 ## Compile
 
 Just `make(1)`. How to build on Windows is left as an exercise to the reader.