diff --git a/h2o-core/src/main/java/water/parser/FVecParseWriter.java b/h2o-core/src/main/java/water/parser/FVecParseWriter.java
index <HASH>..<HASH> 100644
--- a/h2o-core/src/main/java/water/parser/FVecParseWriter.java
+++ b/h2o-core/src/main/java/water/parser/FVecParseWriter.java
@@ -152,7 +152,7 @@ public class FVecParseWriter extends Iced implements StreamParseWriter {
           if (_ctypes[colIdx] == Vec.T_BAD && id > 1) _ctypes[colIdx] = Vec.T_ENUM;
           _nvs[colIdx].addEnum(id);
         } else { // maxed out enum map
-          throw new H2OParseException("Exceeded enumeration limit.  Consider reparsing this column as a string.");
+          throw new H2OParseException("Exceeded enumeration limit on column #"+(colIdx+1)+" (using 1-based indexing).  Consider reparsing this column as a string.");
         }
       }
     }
Gives the column number when the enumeration limit is exceeded.