diff --git a/derparse-rs/src/main.rs b/derparse-rs/src/main.rs
index fc55a0a..4a34813 100755
--- a/derparse-rs/src/main.rs
+++ b/derparse-rs/src/main.rs
@@ -6,6 +6,7 @@
 //! der-parser = "8.2.0"
 //! hex = "0.4.3"
 //! oid-registry = { version = "0.6.1", features = ["x962", "x509", "crypto", "pkcs1", "pkcs12", "pkcs7", "pkcs9", "kdf", "ms_spc", "nist_algs"] }
+//! pem = "3.0.4"
 //! ```
 
 use std::fs;