1 files changed, 5 insertions, 0 deletions
diff --git a/extractor/sampler.h b/extractor/sampler.h
index cda28b10..be4aa1bb 100644
--- a/extractor/sampler.h
+++ b/extractor/sampler.h
@@ -10,18 +10,23 @@ namespace extractor {
 class PhraseLocation;
 class SuffixArray;
 
+/**
+ * Provides uniform sampling for a PhraseLocation.
+ */
 class Sampler {
  public:
   Sampler(shared_ptr<SuffixArray> suffix_array, int max_samples);
 
   virtual ~Sampler();
 
+  // Samples uniformly at most max_samples phrase occurrences.
   virtual PhraseLocation Sample(const PhraseLocation& location) const;
 
  protected:
   Sampler();
 
  private:
+  // Round floating point number to the nearest integer.
   int Round(double x) const;
 
   shared_ptr<SuffixArray> suffix_array;