- If the variable @code{apropos-do-all} is non-@code{nil}, the apropos
-commands always behave as if they had been given a prefix argument.
+ If the variable @code{apropos-do-all} is non-@code{nil}, most
+apropos commands behave as if they had been given a prefix argument.
+There is one exception: @code{apropos-variable} without a prefix
+argument will always search for all variables, no matter what the
+value of @code{apropos-do-all} is.