diff --git a/_posts/2014-08-20-copyvio-detector.md b/_posts/2014-08-20-copyvio-detector.md
index a4e065b..a98a5c9 100644
--- a/_posts/2014-08-20-copyvio-detector.md
+++ b/_posts/2014-08-20-copyvio-detector.md
@@ -15,8 +15,8 @@ available on [GitHub](//github.com/earwig/copyvios).
 One of the most important aspects of the detector is not fetching and parsing
 potential sources, but figuring out the likelihood that a given article is a
 violation of a given source. We call this number, a value between 0 and 1, the
-"confidence" of a violation. Values between 0 and 0.5 indicate no violation
-(green background in results page), between 0.5 and 0.75 a "possible" violation
+"confidence" of a violation. Values between 0 and 0.4 indicate no violation
+(green background in results page), between 0.4 and 0.75 a "possible" violation
 (yellow background), and between 0.75 and 1 a "suspected" violation (red
 background).
 
diff --git a/static/article-delta_confidence_function.pdf b/static/article-delta_confidence_function.pdf
index 1a16d1b..03fae11 100644
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diff --git a/static/delta_confidence_function.pdf b/static/delta_confidence_function.pdf
index c4150ff..d9f2fcd 100644
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