diff --git a/writeExcel.py b/writeExcel.py
index b4fbd03d60e3271a314e3234047d82bba8eb5143..662dd0d9b7b7b139ef5951af4e9eac8e1d1257bb 100644
--- a/writeExcel.py
+++ b/writeExcel.py
@@ -21,7 +21,16 @@ class ExcelWriter:
         When inserting an entry, it might be a test being re-run. In that case,
         the row containing that test needs to be updated, as opposed to appending
         the entry to the end of the file.
+        This method finds that row, returning the row number,
+        or -1 in the case where that test is not in the report yet.
         """
+        for cell in self.ws["A"]:
+            if cell.value is None:
+                return -1
+            elif cell.value == id:
+                print("MATCH with id {} at row {}".format(id, cell.row))
+                return cell.row
+        return -1
     
     def getLastRow(self):
         for cell in self.ws["A"]:
@@ -30,10 +39,18 @@ class ExcelWriter:
         return cell.row + 1
     
     def writeTestEntry(self, testEntry):
+        existingEntryRow = self.getEntryWithId(testEntry.id)
         lastRow = self.getLastRow()
+        # Use the above two values to pick a row
+        entryRow = existingEntryRow if existingEntryRow != -1 else lastRow
+
+        # Pick a cell color based on test outcome
         cellCol = ExcelWriter.PASS_COL if testEntry.result == "PASS" else ExcelWriter.FAIL_COL
+
+        # Test entry as a list
         entryVals = testEntry.asList()
-        for col, cellValue in zip(self.ws.iter_cols(min_row=lastRow, max_col=len(entryVals), max_row=lastRow), entryVals):
+
+        for col, cellValue in zip(self.ws.iter_cols(min_row=entryRow, max_col=len(entryVals), max_row=entryRow), entryVals):
             for cell in col:
                 cell.value = cellValue
                 cell.fill = PatternFill("solid", fgColor=cellCol)# cellCol