Document that variables should not be called -p

* doc/lispref/tips.texi (Coding Conventions): Document that
variables should now be called -p (bug#26564).

1 files changed, 3 insertions, 1 deletions

diff --git a/doc/lispref/tips.texi b/doc/lispref/tips.texi
index 6d84cfef53b..9f6420949de 100644
--- a/doc/lispref/tips.texi
+++ b/doc/lispref/tips.texi
@@ -158,7 +158,9 @@ If the purpose of a function is to tell you whether a certain
 condition is true or false, give the function a name that ends in
 @samp{p} (which stands for ``predicate'').  If the name is one word,
 add just @samp{p}; if the name is multiple words, add @samp{-p}.
-Examples are @code{framep} and @code{frame-live-p}.
+Examples are @code{framep} and @code{frame-live-p}.  This predicate
+suffix should not be used in variable names (i.e., you should name a
+variable @code{foo-feature} instead of @code{foo-feature-p}).
 
 @item
 If the purpose of a variable is to store a single function, give it a