1 files changed, 6 insertions, 4 deletions
diff --git a/gas/expr.h b/gas/expr.h
index 14787c4..2be3d69 100644
--- a/gas/expr.h
+++ b/gas/expr.h
@@ -131,10 +131,12 @@ typedef struct expressionS
   unsigned char X_op;
 #endif
 
-  /* Non-zero if X_add_number should be regarded as unsigned.  This is
-     only valid for O_constant expressions.  It is only used when an
-     O_constant must be extended into a bignum (i.e., it is not used
-     when performing arithmetic on these values).
+  /* Non-zero if the expression value should be regarded as unsigned.  This is
+     only valid for
+     - O_constant expressions, where it is only used when an O_constant must be
+       extended into a bignum (i.e., it is not used when performing arithmetic
+       on these values),
+     - O_big integer expressions, i.e. when X_add_number is positive.
      FIXME: This field is not set very reliably.  */
   unsigned int X_unsigned : 1;
   /* This is used to implement "word size + 1 bit" arithmetic, so that e.g.