diff --git a/alib2algo/src/tree/properties/ReversedBadCharacterShiftTable.h b/alib2algo/src/tree/properties/ReversedBadCharacterShiftTable.h
index ad2e930901242871fac187395d437633b7d1a282..4cf4a3d779f25c3bcb72f1ec849f9e05ca40e9c5 100644
--- a/alib2algo/src/tree/properties/ReversedBadCharacterShiftTable.h
+++ b/alib2algo/src/tree/properties/ReversedBadCharacterShiftTable.h
@@ -65,8 +65,7 @@ ext::map < common::ranked_symbol < SymbolType, RankType >, size_t > ReversedBadC
 	 // of the first symbol representing the variable's bar
 	size_t firstSBarOffset = FirstVariableOffsetFront::offset ( pattern ) + 1;
 
-	// limit the shift by occurrence of the last variable
-
+	// limit the shift by occurrence of the last variable's bar
 	for ( const common::ranked_symbol < SymbolType, RankType > & symbol : alphabet ) {
 		if ( ( symbol == pattern.getSubtreeWildcard ( ) ) || ( pattern.getNonlinearVariables ( ).count ( symbol ) ) || ( symbol == pattern.getVariablesBar ( ) ) ) continue;
 
@@ -118,9 +117,10 @@ ext::map < common::ranked_symbol < SymbolType, RankType >, size_t > ReversedBadC
 	}
 
 	 // find the distance between the beginning of the pattern and the index
-	 // of the first symbol representing the variable's bar
+	 // of the first symbol representing the variable
 	size_t firstSOffset = FirstVariableOffsetFront::offset ( pattern );
 
+	// handle situation when the pattern is just S
 	if ( firstSOffset == 0 ) firstSOffset = 1;
 
 	 // limit the shift by occurrence of the last variable