diff --git a/StandardizedClinicalDataTables/FACT_RELATIONSHIP.md b/StandardizedClinicalDataTables/FACT_RELATIONSHIP.md
index c69f0a9..6660069 100644
--- a/StandardizedClinicalDataTables/FACT_RELATIONSHIP.md
+++ b/StandardizedClinicalDataTables/FACT_RELATIONSHIP.md
@@ -2,7 +2,7 @@ The FACT_RELATIONSHIP table contains records about the relationships between fac
 
 Field|Required|Type|Description
 :-------------------------|:--------|:------------|:--------------------------------------------------------------
-|domain_concept _id_1|Yes|integer|The concept representing the domain of fact one, from which the corresponding table can be inferred.|
+|domain_concept_id_1|Yes|integer|The concept representing the domain of fact one, from which the corresponding table can be inferred.|
 |fact_id_1|Yes|integer|The unique identifier in the table corresponding to the domain of fact one.|
 |domain_concept_id_2|Yes|integer|The concept representing the domain of fact two, from which the corresponding table can be inferred.|
 |fact_id_2|Yes|integer|The unique identifier in the table corresponding to the domain of fact two.|