diff --git a/apps/deckcraft-cli/src/main.rs b/apps/deckcraft-cli/src/main.rs
index 1c38bfd6..240c5926 100644
--- a/apps/deckcraft-cli/src/main.rs
+++ b/apps/deckcraft-cli/src/main.rs
@@ -570,6 +570,18 @@ mod tests {
         assert!(describe(Some("--help")).is_ok());
         assert!(mcp(&args(&["-h"])).is_ok());
     }
+
+    #[test]
+    fn render_refuses_an_unknown_option_instead_of_writing_it_as_a_file() {
+        let out = std::env::temp_dir().join("deckcraft-cli-unknown-option.png");
+        let _ = std::fs::remove_file(&out);
+        for flag in ["--bogus", "-x"] {
+            let args: Vec<String> = ["--sample", flag, &out.to_string_lossy()].iter().map(|a| a.to_string()).collect();
+            let e = render(&args).unwrap_err();
+            assert!(e.contains(&format!("unknown option `{flag}`")), "{flag}: {e}");
+            assert!(!out.exists(), "{flag}: rendered anyway");
+        }
+    }
 }
 
 #[cfg(test)]
diff --git a/contributors/people.toml b/contributors/people.toml
index cb11317d..893cc065 100644
--- a/contributors/people.toml
+++ b/contributors/people.toml
@@ -48,3 +48,6 @@ sync_github_name = true
 
 [people.Momentum96]
 sync_github_name = true
+
+[people.RCShoemaker]
+real_name = "Ryan C. Shoemaker"