diff --git a/docs/index.md b/docs/index.md
index 231a670d84a3a7a3d55a4c36a59db5251fd59b6c..4111380f98b93192c374b7fac063489fcb5b9ba5 100755
--- a/docs/index.md
+++ b/docs/index.md
@@ -30,7 +30,8 @@ For each file this workflow:
 
     SampleID
         This ID should match the name in the fastq file ie S0001.R1.fastq.gz the sample ID is S0001
-        Note: SampleID shouldn't start with numbers ie 10C should be changed to S10C
+        Notes: SampleID shouldn't start with numbers ie 10C should be changed to S10C
+               SampleID should contain only alphanumeric characters ie the '_', '.', and '-' characters should be removed from "treated_sample.1-1"
     SampleName
         This ID can be the identifier of the researcher or clinician
     SubjectID
diff --git a/docs/index.md.vc b/docs/index.md.vc
index 0fe1c4c79040eba3a9ae340efe1939434d1758c2..df6f738330a4f5848a65e6ac14ae1314621e2756 100755
--- a/docs/index.md.vc
+++ b/docs/index.md.vc
@@ -38,7 +38,8 @@ For each file this workflow:
 
     SampleID
         This ID should match the name in the fastq file ie S0001.R1.fastq.gz the sample ID is S0001
-        Note: SampleID shouldn't start with numbers ie 10C should be changed to S10C
+        Notes: SampleID shouldn't start with numbers ie 10C should be changed to S10C
+               SampleID should contain only alphanumeric characters ie the '_', '.', and '-' characters should be removed from "treated_sample.1-1"
     SampleName
         This ID can be the identifier of the researcher or clinician
     SubjectID