diff --git a/2021-Romanowska-001/NASSA.yml b/2021-Romanowska-001/NASSA.yml
index 1ed2127..cc988a5 100644
--- a/2021-Romanowska-001/NASSA.yml
+++ b/2021-Romanowska-001/NASSA.yml
@@ -54,4 +54,4 @@ outputs:
     type: float (absolute position) or integer (patch coordinate)
     unit: no specific unit, but within world dimensions
     description: Current position of the agent (turtle) as x and y coordinates.
-license: CC BY-SA 4.0
+license: CC-BY-SA-4.0
diff --git a/2022-Romanowska-002/NASSA.yml b/2022-Romanowska-002/NASSA.yml
index f3bd59a..4bfe17f 100644
--- a/2022-Romanowska-002/NASSA.yml
+++ b/2022-Romanowska-002/NASSA.yml
@@ -82,4 +82,4 @@ outputs:
   - name: tickcounter
     type: integer
     description: simulation time step counter
-license: CC BY-SA 4.0
+license: CC-BY-SA-4.0
diff --git a/2022-Vlach-001/NASSA.yml b/2022-Vlach-001/NASSA.yml
index 2812cef..acef78d 100644
--- a/2022-Vlach-001/NASSA.yml
+++ b/2022-Vlach-001/NASSA.yml
@@ -145,4 +145,4 @@ outputs:
   - name: nw-mod
     type: float
     description: Network metrics':' modularity
-license: CC BY-SA 4.0
+license: CC-BY-SA-4.0