diff --git a/ChangeLog b/ChangeLog
index bb084a17..0439a65b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2010-03-08  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
+
+	Added debug logs.
+	* src/FileEntry.cc
+	* src/SegmentMan.cc
+
 2010-03-08  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
 
 	Fixed unit test error with mingw32 build.
diff --git a/src/FileEntry.cc b/src/FileEntry.cc
index 78cbdde0..5e921016 100644
--- a/src/FileEntry.cc
+++ b/src/FileEntry.cc
@@ -306,6 +306,10 @@ void FileEntry::reuseUri(size_t num)
   size_t ininum = reusableURIs.size();
   if(_logger->debug()) {
     _logger->debug("Found %u reusable URIs", static_cast<unsigned int>(ininum));
+    for(std::vector<std::string>::const_iterator i = reusableURIs.begin(),
+          eoi = reusableURIs.end(); i != eoi; ++i) {
+      _logger->debug("URI=%s", (*i).c_str());
+    }
   }
   // Reuse at least num URIs here to avoid to
   // run this process repeatedly.
diff --git a/src/SegmentMan.cc b/src/SegmentMan.cc
index 47e47676..e8019afa 100644
--- a/src/SegmentMan.cc
+++ b/src/SegmentMan.cc
@@ -395,6 +395,12 @@ size_t SegmentMan::countFreePieceFrom(size_t index) const
 
 void SegmentMan::ignoreSegmentFor(const SharedHandle<FileEntry>& fileEntry)
 {
+  if(logger->debug()) {
+    logger->debug("ignoring segment for path=%s, offset=%s, length=%s",
+                  fileEntry->getPath().c_str(),
+                  util::itos(fileEntry->getOffset()).c_str(),
+                  util::uitos(fileEntry->getLength()).c_str());
+  }
   _ignoreBitfield.addFilter(fileEntry->getOffset(), fileEntry->getLength());
 }