diff --git a/core/include/seqan/align/gap_anchor.h b/core/include/seqan/align/gap_anchor.h
index 7e82f38d9b..76d5c89446 100644
--- a/core/include/seqan/align/gap_anchor.h
+++ b/core/include/seqan/align/gap_anchor.h
@@ -65,8 +65,8 @@ typedef Tag<SortGapPos_> const SortGapPos;
  * @headerfile <seqan/align.h>
  * @brief Stores the position of an alignment character in sequence-space and in gap-space.
  * 
- * @signature template <typename TPosition>
- *            struct GapAnchor;
+ * @signature template <typename TPos>
+ *            struct GapAnchor<TPos>;
  * 
  * @tparam TPos Type to store gapped/ungapped positions.
  * 
@@ -106,14 +106,14 @@ template <typename TPos>
 struct GapAnchor
 {
 /*!
- * @var VariableType GapAnchor::seqPos
- * @brief Sequence character position in the ungapped sequence.
+ * @var TPos GapAnchor::seqPos
+ * @brief Sequence character position in the ungapped sequence (e.g. @link IntegerConcept @endlink).
  */
 	TPos	seqPos;			// sequence character position in the ungapped sequence
 
 /*!
- * @var VariableType GapAnchor::gapPos
- * @brief Sequence character position in the gapped sequence.
+ * @var TPos GapAnchor::gapPos
+ * @brief Sequence character position in the gapped sequence (e.g. @link IntegerConcept @endlink).
  */
 	TPos	gapPos;			// sequence character position in the gapped sequence
 
diff --git a/core/include/seqan/align/gaps_base.h b/core/include/seqan/align/gaps_base.h
index 4d17b78b4d..62ea74abf3 100644
--- a/core/include/seqan/align/gaps_base.h
+++ b/core/include/seqan/align/gaps_base.h
@@ -78,7 +78,7 @@ typedef Tag<ArrayGaps_> ArrayGaps;
  * @brief Store the gapped version of a sequence.
  *
  * @signature template <typename TSequence, typename TSpec>
- *            class Gaps;
+ *            class Gaps<TSequence, TSpec>;
  *
  * @tparam TSequence The type of the underlying sequence.
  * @tparam TSpec     Tag for specialization.
diff --git a/core/include/seqan/stream/stream_gz_file.h b/core/include/seqan/stream/stream_gz_file.h
index 83eb971739..f0501fafc7 100644
--- a/core/include/seqan/stream/stream_gz_file.h
+++ b/core/include/seqan/stream/stream_gz_file.h
@@ -55,6 +55,8 @@ inline void close(Stream<GZFile> & stream);
 
 /*!
  * @class GzFileStream
+ * @extends Stream
+ * @extends StreamConcept
  * @headerfile <seqan/stream.h>
  * @brief Allows to open gzip-compressed files.
  * @signature template <>