update documentation

src/perfguru.py

@@ -128,7 +128,8 @@ with gr.Blocks(css=".not-voted p { color: black; } .voted p { color: green; } .r
     gr.Markdown("""## Upload Code Files and Performance Profile
     
                 You must upload at least one source code file to proceed. You can also upload a performance profile if you have one.
-                Currently supported formats are HPCToolkit, CProfile, and Caliper.""")
+                Currently supported formats are HPCToolkit, CProfile, and Caliper. CProfile and Caliper files can be uploaded directly.
+                HPCToolkit database directories should be zipped before uploading (i.e. `hpctoolkit-database.zip`).""")
     with gr.Row():
         code_files = gr.File(label="Upload Code File", file_count='multiple')