diff --git a/src/protocol.h b/src/protocol.h
--- a/src/protocol.h
+++ b/src/protocol.h
@@ -181,7 +181,7 @@
 /**
  * The notfound message is a reply to a getdata message which requested an
  * object the receiving node does not have available for relay.
- * @ince protocol version 70001.
+ * @since protocol version 70001.
  * @see https://bitcoin.org/en/developer-reference#notfound
  */
 extern const char *NOTFOUND;
diff --git a/src/util/system.h b/src/util/system.h
--- a/src/util/system.h
+++ b/src/util/system.h
@@ -250,7 +250,7 @@
      * Return string argument or default value.
      *
      * @param strArg Argument to get (e.g. "-foo")
-     * @param default (e.g. "1")
+     * @param strDefault (e.g. "1")
      * @return command-line argument or default value
      */
     std::string GetArg(const std::string &strArg,
@@ -260,7 +260,7 @@
      * Return integer argument or default value.
      *
      * @param strArg Argument to get (e.g. "-foo")
-     * @param default (e.g. 1)
+     * @param nDefault (e.g. 1)
      * @return command-line argument (0 if invalid number) or default value
      */
     int64_t GetArg(const std::string &strArg, int64_t nDefault) const;
@@ -269,7 +269,7 @@
      * Return boolean argument or default value.
      *
      * @param strArg Argument to get (e.g. "-foo")
-     * @param default (true or false)
+     * @param fDefault (true or false)
      * @return command-line argument or default value
      */
     bool GetBoolArg(const std::string &strArg, bool fDefault) const;