clarify Ensembl ID error

app.py

@@ -225,7 +225,7 @@ def _embed(adata_bytes, layer_name, feature_col, use_symbols, progress):
 
     # check for Ensembl IDs in feature column
     if not adata.var[feature_col].str.startswith("ENSG").any():
-        raise gr.Error(f"Feature column '{feature_col}' does not appear to contain Ensembl gene IDs. If the column contains gene symbols, use the checkbox.")
+        raise gr.Error(f"Feature column '{feature_col}' does not appear to contain human Ensembl gene IDs. If the column contains gene symbols, use the checkbox.")
 
     # load model
     progress(0.15, desc="loading model")