diff --git a/src/cli/completion.rs b/src/cli/completion.rs
index 1effe0a32..b408e683a 100644
--- a/src/cli/completion.rs
+++ b/src/cli/completion.rs
@@ -44,6 +44,8 @@ impl Completion {
             )
             .run();
             if res.is_err() {
+                debug!("usage command failed, falling back to prerendered completions");
+                debug!("error: {:?}", res);
                 return self.prerendered(shell);
             }
             return Ok(());