add version check

2 files changed, 3 insertions, 2 deletions

diff --git a/README.md b/README.md
index 22f5e2c..2e0c6a3 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 fakecanvas is an attempt at emulating the functionality of canvases (render to texture) for hardware that does not support them.
 
-it is more or less a drop-in library, in that all you need to do is call `require 'fakecanvas'` (preferably inside `love.load`) to use it. fakecanvas' own functions will only be used if `love.graphics.isSupported "canvas"` is false, unless this behavior is overridden (see below).
+it is more or less a drop-in library, in that all you need to do is call `require 'fakecanvas'` (preferably inside `love.load`) to use it. fakecanvas' own functions will only be used if `love.graphics.isSupported "canvas"` is false, unless this behavior is overridden (see below). note: you must be using LÖVE 0.8
 
 it uses (a few) screenshots in order to isolate drawing operations, which means there are some amusing drawbacks:
 
@@ -51,7 +51,7 @@ fakecanvas directly replaces some of LÖVE's functions, so there are no special
 * `setOption(name, value)`: sets the option `name` to `value`. current options are:
  * `"vflip"`: use vertically-flipped texture coords for the canvas image, to match those of real canvases. visually this makes no difference, but does make a difference inside shaders. if your shaders are not sensitive to this information, you can disable this option and get a possible performance boost. by setting this option before calling `setCanvas()`, you can control this behavior on a per fake canvas basis. boolean: default `true`
 
-* `getOption(name)`: gets the current value of option `name`.
+* `getOption(name)`: gets the current value of option `name`
  
 ### Example main.lua
 
diff --git a/fakecanvas.lua b/fakecanvas.lua
index b170896..3827366 100644
--- a/fakecanvas.lua
+++ b/fakecanvas.lua
@@ -24,6 +24,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 --]]
 
+assert(love._version:match "^0.8", "fakecanvas requires LOVE 0.8")
 assert(debug, "fake canvases require access to the debug library")
 
 local canvas_supported      = love.graphics.isSupported "canvas"