Updated README

README.textile

@@ -41,7 +41,7 @@ So how do we get them? Try adding a viewport to ask Google to limit results to a
 <pre><code>centroid = (34.039020123166175, -118.24590404333648)
 span = (0.037236705899272908, 0.034925735835917911)</code></pre>
 
-*Now check this out. The viewport will limit our results to just the downtown address.*
+Now check this out. The viewport will limit our results to just the downtown address. One trick is to remove the city designation here, as it can just muddle things up.
 <pre><code>point_generator = g.geocode(
     '202 W. 1st St.',
     exactly_one=False,