1 files changed, 4 insertions, 1 deletions
diff --git a/src/bin/subplot.rs b/src/bin/subplot.rs
index 907e616..a85ad62 100644
--- a/src/bin/subplot.rs
+++ b/src/bin/subplot.rs
@@ -308,7 +308,10 @@ impl Docgen {
     }
 
     fn mtime(filename: &Path) -> Result<(u64, u32)> {
-        let mtime = fs::metadata(filename)?.modified()?;
+        let mtime = fs::metadata(filename)
+            .map_err(|e| SubplotError::InputFileUnreadable(filename.into(), e))?
+            .modified()
+            .map_err(|e| SubplotError::InputFileMtime(filename.into(), e))?;
         let mtime = mtime.duration_since(UNIX_EPOCH)?;
         Ok((mtime.as_secs(), mtime.subsec_nanos()))
     }