diff --git a/doc/pages/Manual.md b/doc/pages/Manual.md
index 062aaecf749..d7a27ee6c9b 100644
--- a/doc/pages/Manual.md
+++ b/doc/pages/Manual.md
@@ -492,9 +492,11 @@ the package being defined.
   resolved direct dependencies of the package
 - <a id="pkgvar-installed">`installed`</a>:
   whether the package is installed
-- <a id="pkgvar-enable">`enable`</a>:
-  takes the value "enable" or "disable" depending on whether the package is
-  installed
+- <a id="pkgvar-enable">`enable`</a>: is not a variable.
+  It takes the value "enable" or "disable" depending on whether the package is
+  installed. Used with the combination operator `+`, 
+  `name1+name2+name3:enable` is syntactic sugar for
+  `name1+name2+name3:installed?enable:disable`.
 - <a id="pkgvar-pinned">`pinned`</a>: whether the package is pinned
 - <a id="pkgvar-dirs">`bin`, `sbin`, `lib`, `man`, `doc`, `share`, `etc`</a>:
   the corresponding directories for this package (similar to
diff --git a/master_changes.md b/master_changes.md
index 87e54d5acee..5c93227796c 100644
--- a/master_changes.md
+++ b/master_changes.md
@@ -113,6 +113,8 @@ users)
 
 ## Doc
 
+  * Clarify documentation for `enable` pseudo-variable
+
 ## Security fixes
 
 # API updates