title: ggplot2: Label not showing with the geom_text() function
body: <p>I have a data frame, and I've made a scatter plot based on it (with ggplot2). Something like this:</p>
  <pre><code>df = data.frame(x = letters, y = c(1:26))
  p = ggplot(df, aes(x = x, y = y)) + geom_point()
  </code></pre>
  <p>But I want to add a specific label to the plot (using geom_text), in a certain coordenate. The problem is that the label isn't showing in the printed plot.</p>
  <pre><code>p + geom_text(x = 3, y = 30, label = &quot;Scatter plot&quot;)
  
  </code></pre>
  <p><a href="https://i.stack.imgur.com/q3PU9.png" rel="nofollow noreferrer">Plot without printed label</a></p>
  <p>This particular error just appears only if I want to use coordinates, 'cause if I remove the coordinates the plot is printed with the labels (although it appears in every point in the plot).</p>
  <p>Am I writing something wrong?</p>