diff --git a/_slides/09_singularity.md b/_slides/09_singularity.md
index f1063ae3..7a04be17 100644
--- a/_slides/09_singularity.md
+++ b/_slides/09_singularity.md
@@ -165,7 +165,7 @@ apptainer_wrapper exec myprog <options>
 # Building using a definition file
 
 - Provides transparency
-  - Everybody can see what comands were used to build the container
+  - Everybody can see what commands were used to build the container
 - Definition files reusable
   - Updating the software typically only requires minor changes to the file
 - Can be a bit cumbersome if you have to try many things (e.g. installing missing libraries)