compiling sketch

Arduino: 1.6.9 (Windows XP), Board: "Arduino/Genuino Uno"
I copied a temperature/humidity sketch from
online tutorial and received this message when compiling.
See attached copy of error message.
Any clues as to what is in error?

C:\Documents and Settings\Richard\My Documents\Arduino\TEMP-HUM\TEMP-HUM.ino:10:19: fatal error: dht11.h: No such file or directory

#include <dht11.h>

^

compilation terminated.

exit status 1
Error compiling for board Arduino/Genuino Uno.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

arteegee:
That library is downloaded and installed under a second tab in the new sketch I am trying to write.

Change

 #include <dht11.h>

to

 #include "dht11.h"

assuming, that is, that all of the library files are in the same folder as the sketch.

Alternatively, install the library folder in the libraries folder of your sketchbook folder.

Either way, restart the IDE afterwards