diff --git a/helper/ccnb-parser/syntax-tree/ccnb-parser-dtag.cc b/helper/ccnb-parser/syntax-tree/ccnb-parser-dtag.cc
index 68fc794..e7d9b98 100644
--- a/helper/ccnb-parser/syntax-tree/ccnb-parser-dtag.cc
+++ b/helper/ccnb-parser/syntax-tree/ccnb-parser-dtag.cc
@@ -33,7 +33,7 @@
   /**
    * Hack
    *
-   * Stop processing after encountering <Content> dtag.  Actual
+   * Stop processing after encountering "Content" dtag.  Actual
    * content (including virtual payload) will be stored in Packet
    * buffer
    */
diff --git a/helper/ccnb-parser/syntax-tree/ccnb-parser-dtag.h b/helper/ccnb-parser/syntax-tree/ccnb-parser-dtag.h
index 1ff75e3..cca0bba 100644
--- a/helper/ccnb-parser/syntax-tree/ccnb-parser-dtag.h
+++ b/helper/ccnb-parser/syntax-tree/ccnb-parser-dtag.h
@@ -43,7 +43,7 @@
    *
    * DTAG parsing is slightly hacked to provide memory optimization
    * for NS-3 simulations.  Parsing will be stopped after encountering
-   * <Content> dtag.  Actual content (including virtual payload) will
+   * "Content" dtag.  Actual content (including virtual payload) will
    * be stored in Packet buffer
    *
    * \see http://www.ccnx.org/releases/latest/doc/technical/BinaryEncoding.html
diff --git a/helper/ccnb-parser/visitors/ccnb-parser-depth-first-visitor.h b/helper/ccnb-parser/visitors/ccnb-parser-depth-first-visitor.h
index d68b4ad..98c3c96 100644
--- a/helper/ccnb-parser/visitors/ccnb-parser-depth-first-visitor.h
+++ b/helper/ccnb-parser/visitors/ccnb-parser-depth-first-visitor.h
@@ -27,7 +27,7 @@
 namespace CcnbParser {
 
 /**
- * \ingrou ccnx-ccnb
+ * \ingroup ccnx-ccnb
  * \brief Depth-first visitor that takes boot::any as argument and returns boost::any value
  */
 class DepthFirstVisitor : public Visitor
diff --git a/helper/ccnb-parser/visitors/ccnb-parser-no-argu-depth-first-visitor.h b/helper/ccnb-parser/visitors/ccnb-parser-no-argu-depth-first-visitor.h
index 1990d87..7d3841d 100644
--- a/helper/ccnb-parser/visitors/ccnb-parser-no-argu-depth-first-visitor.h
+++ b/helper/ccnb-parser/visitors/ccnb-parser-no-argu-depth-first-visitor.h
@@ -27,7 +27,7 @@
 namespace CcnbParser {
 
 /**
- * \ingrou ccnx-ccnb
+ * \ingroup ccnx-ccnb
  * \brief Depth-first visitor that takes no arguments and returns boost::any value
  */
 class NoArguDepthFirstVisitor : public NoArguVisitor
diff --git a/helper/ccnb-parser/visitors/ccnb-parser-void-depth-first-visitor.h b/helper/ccnb-parser/visitors/ccnb-parser-void-depth-first-visitor.h
index f2b78e3..35283d2 100644
--- a/helper/ccnb-parser/visitors/ccnb-parser-void-depth-first-visitor.h
+++ b/helper/ccnb-parser/visitors/ccnb-parser-void-depth-first-visitor.h
@@ -27,7 +27,7 @@
 namespace CcnbParser {
 
 /**
- * \ingrou ccnx-ccnb
+ * \ingroup ccnx-ccnb
  * \brief Depth-first visitor that takes one argument and returns nothing
  */
 class VoidDepthFirstVisitor : public VoidVisitor
diff --git a/helper/ccnb-parser/visitors/ccnb-parser-void-no-argu-depth-first-visitor.h b/helper/ccnb-parser/visitors/ccnb-parser-void-no-argu-depth-first-visitor.h
index 9237c2c..e796c7f 100644
--- a/helper/ccnb-parser/visitors/ccnb-parser-void-no-argu-depth-first-visitor.h
+++ b/helper/ccnb-parser/visitors/ccnb-parser-void-no-argu-depth-first-visitor.h
@@ -27,7 +27,7 @@
 namespace CcnbParser {
 
 /**
- * \ingrou ccnx-ccnb
+ * \ingroup ccnx-ccnb
  * \brief Depth-first visitor that takes no arguments and returns nothing
  */
 class VoidNoArguDepthFirstVisitor : public VoidNoArguVisitor