Current version and revision output

diff --git a/TradeFilter3.lua b/TradeFilter3.lua
index cf1ff4a..4702054 100644
--- a/TradeFilter3.lua
+++ b/TradeFilter3.lua
@@ -70,7 +70,7 @@ local PATCH_VERSION = "@project-revision@"
 if (find(MAJOR_VERSION, "release" or "beta")) then
 	TF3.version = MAJOR_VERSION
 else
-	TF3.version = PATCH_VERSION .. " DEV"
+	TF3.version = "r" .. PATCH_VERSION .. " DEV"
 end
 TF3.date = "@file-date-iso@"