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-rw-r--r--extractor/features/is_source_singleton.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/extractor/features/is_source_singleton.h b/extractor/features/is_source_singleton.h
index 30f76c6d..b8352d0e 100644
--- a/extractor/features/is_source_singleton.h
+++ b/extractor/features/is_source_singleton.h
@@ -6,6 +6,9 @@
namespace extractor {
namespace features {
+/**
+ * Boolean feature checking if the source phrase occurs only once in the data.
+ */
class IsSourceSingleton : public Feature {
public:
double Score(const FeatureContext& context) const;