diff --git a/libwccl/parser/grammar.g b/libwccl/parser/grammar.g
index a87139adcccf9c79ed0d228e9a7b2b83359885e6..0473540241f6b7ac236a752ded0ee4e2347398f2 100644
--- a/libwccl/parser/grammar.g
+++ b/libwccl/parser/grammar.g
@@ -689,7 +689,7 @@ symset_operator
 ;
 
 // ----------------------------------------------------------------------------
-// It's wrapper for symset variable and symset value.
+// A wrapper for symset variable and symset value.
 symset_var_val
 	[const Corpus2::Tagset& tagset, Variables& vars]
 	returns [boost::shared_ptr<Function<TSet> > op]