diff --git a/src/02-common-principles.md b/src/02-common-principles.md
index 70e807a580..de11c4eea5 100644
--- a/src/02-common-principles.md
+++ b/src/02-common-principles.md
@@ -99,7 +99,9 @@ A file name consists of a chain of *entities*, or key-value pairs, a *suffix* an
 Two prominent examples of entities are `subject` and `session`.
 
 For a data file that was collected in a given `session` from a given
-`subject`, the file name will begin with the string `sub-<label>_ses-<label>`.
+`subject`, the file name MUST begin with the string `sub-<label>_ses-<label>`. 
+If the `session` level is omitted in the folder structure, the file name MUST begin 
+with the string `sub-<label>`, without `ses-<label>`.
 
 Note that `sub-<label>` corresponds to the `subject` entity because it has
 the `sub-` "key" and`<label>` "value", where `<label>` would in a real data file
diff --git a/src/99-appendices/01-contributors.md b/src/99-appendices/01-contributors.md
index c01c5eea49..1dcad92197 100644
--- a/src/99-appendices/01-contributors.md
+++ b/src/99-appendices/01-contributors.md
@@ -92,6 +92,7 @@ your name is not listed, please add it.
 -   Gregory Kiar 📖💻🎨🔧
 -   Robert Knight 📖
 -   Jean-Philippe Lachaux 📖
+-   Marc Lalancette 📖
 -   Pamela LaMontagne 📖💡
 -   Kevin Larcher 💬
 -   Jonathan C. Lau 📖