diff --git a/BigFloat.cs b/BigFloat.cs
index d50c1f8..4f5771d 100644
--- a/BigFloat.cs
+++ b/BigFloat.cs
@@ -41,6 +41,7 @@ public int Sign
         //     Denominator = BigInteger.One;
         // }
 
+        [Obsolete("Use BigFloat.Parse instead.")]
         public BigFloat(string value)
         {
             var bf = Parse(value);