- "Whether the apropos commands should do more.
-
-Slows them down more or less. Set this non-nil if you have a fast machine."
+ "Non nil means apropos commands will search more extensively.
+This may be slower. This option affects the following commands:
+
+`apropos-user-option' will search all variables, not just user options.
+`apropos-command' will also search non-interactive functions.
+`apropos' will search all symbols, not just functions, variables, faces,
+and those with property lists.
+`apropos-value' will also search in property lists and functions.
+`apropos-documentation' will search all documentation strings, not just
+those in the etc/DOC documentation file.
+
+This option only controls the default behavior. Each of the above
+commands also has an optional argument to request a more extensive search.
+
+Additionally, this option makes the function `apropos-library'
+include key-binding information in its output."