add a little note at the bottom of the page

src/Literate.jl

@@ -121,6 +121,19 @@ function replace_default(content, sym;
                          )
     repls = Pair{Any,Any}[]
 
+    # add some shameless advertisement
+    if sym === :jl
+        content *= """
+            #-
+            # This file was generated using Literate.jl, https://github.com/fredrikekre/Literate.jl
+            """
+    else
+        content *= """
+            #-
+            #' *This $(sym === :md ? "page" : "notebook") was generated using [Literate.jl](https://github.com/fredrikekre/Literate.jl).*
+            """
+    end
+
     push!(repls, "\r\n" => "\n") # normalize line endings
 
     if sym === :md

test/runtests.jl

@@ -209,6 +209,8 @@ content = """
             # PLACEHOLDER3
             # PLACEHOLDER4
 
+            # This file was generated using Literate.jl, https://github.com/fredrikekre/Literate.jl
+
             """
             script = read(joinpath(outdir, "inputfile.jl"), String)
             @test script == expected_script
@@ -319,6 +321,8 @@ end
             \\int f(x) dx
             ```
 
+            *This page was generated using [Literate.jl](https://github.com/fredrikekre/Literate.jl).*
+
             """
             markdown = read(joinpath(outdir, "inputfile.md"), String)
             @test markdown == expected_markdown
@@ -465,6 +469,12 @@ end
                 "\\\\int f(x) dx\\n",
                 "\\\\end{equation}"
                ]
+            """,
+
+            """
+               "source": [
+                "*This notebook was generated using [Literate.jl](https://github.com/fredrikekre/Literate.jl).*"
+               ]
             """))
 
             notebook = read(joinpath(outdir, "inputfile.ipynb"), String)