diff --git a/he/pm/hepmc2-macros b/he/pm/hepmc2-macros
new file mode 100644
index 00000000000..4d263dffb8b
--- /dev/null
+++ b/he/pm/hepmc2-macros
@@ -0,0 +1 @@
+{"name":"hepmc2-macros","vers":"0.1.0","deps":[{"name":"quote","req":"^1.0","features":[],"optional":false,"default_features":true,"target":null,"kind":"normal"},{"name":"syn","req":"^2.0","features":["full"],"optional":false,"default_features":true,"target":null,"kind":"normal"}],"cksum":"f49a9e4bdfe6d2a5850dfd9e7d52a6bddb020287696fc6519f84bc35a705bb9b","features":{"sync":[],"tokio":[]},"yanked":false}