diff --git a/ex/tr/extra-math b/ex/tr/extra-math
new file mode 100644
index 0000000..8dd340c
--- /dev/null
+++ b/ex/tr/extra-math
@@ -0,0 +1 @@
+{"name":"extra-math","vers":"0.1.0","deps":[{"name":"libm","req":"^0.2.8","features":[],"optional":false,"default_features":true,"target":null,"kind":"normal","registry":"https://github.com/rust-lang/crates.io-index","package":null},{"name":"num-traits","req":"^0.2.19","features":["libm"],"optional":false,"default_features":false,"target":null,"kind":"normal","registry":"https://github.com/rust-lang/crates.io-index","package":null}],"cksum":"fa1061c295d9aba46636f4a0b16372ea314fcd6c8dfaf447cc719a6a9dce63aa","features":{"default":[],"std":["num-traits/std"]},"yanked":false}