diff --git a/src/filter/mod.rs b/src/filter/mod.rs
index 8f7787f0..5ca0dbed 100644
--- a/src/filter/mod.rs
+++ b/src/filter/mod.rs
@@ -299,6 +299,7 @@ fn parse_spec(spec: &str) -> (Vec<Directive>, Option<inner::Filter>) {
         return (dirs, None);
     }
     if let Some(m) = mods {
+        let m = m.replace("-", "_");
         for s in m.split(',').map(|ss| ss.trim()) {
             if s.is_empty() {
                 continue;
@@ -697,6 +698,21 @@ mod tests {
         assert!(filter.is_none());
     }
 
+    #[test]
+    fn parse_spec_replaces_hyphens_in_mods() {
+        let (dirs, filter) = parse_spec("my-crate1::mod1=error,crate1::mod2,my-crate2=debug");
+        assert_eq!(dirs.len(), 3);
+        assert_eq!(dirs[0].name, Some("my_crate1::mod1".to_string()));
+        assert_eq!(dirs[0].level, LevelFilter::Error);
+
+        assert_eq!(dirs[1].name, Some("crate1::mod2".to_string()));
+        assert_eq!(dirs[1].level, LevelFilter::max());
+
+        assert_eq!(dirs[2].name, Some("my_crate2".to_string()));
+        assert_eq!(dirs[2].level, LevelFilter::Debug);
+        assert!(filter.is_none());
+    }
+
     #[test]
     fn parse_spec_invalid_crate() {
         // test parse_spec with multiple = in specification
diff --git a/src/lib.rs b/src/lib.rs
index 31ea7c3d..3301216b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -71,8 +71,8 @@
 //! [2017-11-09T02:12:24Z INFO main] the answer was: 12
 //! ```
 //!
-//! If the binary name contains hyphens, you will need to replace
-//! them with underscores:
+//! If the binary name contains hyphens, they need to be replaced with underscores.
+//! The library handles this case automatically, in case you forget:
 //!
 //! ```{.bash}
 //! $ RUST_LOG=my_app ./my-app