diff --git a/alib2data/src/regexp/formal/FormalRegExpSymbol.h b/alib2data/src/regexp/formal/FormalRegExpSymbol.h
index 9912dad383e0d5541233e710c140e691e5564ecc..6763920ff1d53880e3bf4a21b720aaafb0c09a15 100644
--- a/alib2data/src/regexp/formal/FormalRegExpSymbol.h
+++ b/alib2data/src/regexp/formal/FormalRegExpSymbol.h
@@ -57,6 +57,8 @@ class FormalRegExpSymbol : public FormalRegExpElement < SymbolType >, public ext
 public:
 	/**
 	 * \brief Creates a new instance of the symbol node using the actual symbol to represent.
+	 *
+	 * \param symbol the value of the represented symbol
 	 */
 	explicit FormalRegExpSymbol ( SymbolType symbol );
 
diff --git a/alib2data/src/regexp/unbounded/UnboundedRegExpSymbol.h b/alib2data/src/regexp/unbounded/UnboundedRegExpSymbol.h
index ce5272e9c0bea4d8a5e84c2b76b93dd04fc13505..305650bde26773085984d29d703f355eb92b0817 100644
--- a/alib2data/src/regexp/unbounded/UnboundedRegExpSymbol.h
+++ b/alib2data/src/regexp/unbounded/UnboundedRegExpSymbol.h
@@ -57,6 +57,8 @@ class UnboundedRegExpSymbol : public UnboundedRegExpElement < SymbolType >, publ
 public:
 	/**
 	 * \brief Creates a new instance of the symbol node using the actual symbol to represent.
+	 *
+	 * \param symbol the value of the represented symbol
 	 */
 	explicit UnboundedRegExpSymbol ( SymbolType symbol );