-(defun bs--configuration-name-for-prefix-arg (prefix-arg)
- "Convert prefix argument PREFIX-ARG to a name of a buffer configuration.
-If PREFIX-ARG is nil return `bs-default-configuration'.
-If PREFIX-ARG is an integer return PREFIX-ARG element of `bs-configurations'.
+(defun bs--configuration-name-for-prefix-arg (prefix)
+ "Convert prefix argument PREFIX to a name of a buffer configuration.
+If PREFIX is nil return `bs-default-configuration'.
+If PREFIX is an integer return PREFIX element of `bs-configurations'.