Update readme.md (Homebrew#76382)

smdharris · Jan 31, 2020 · 9982e07 · 9982e07
1 parent 7f267f2
commit 9982e07
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/doc/cask_language_reference/readme.md b/doc/cask_language_reference/readme.md
@@ -50,7 +50,10 @@ if MacOS.version <= :mavericks     # symbolic name
 if MacOS.version <= '10.9'         # version string
 ```
 
-The available symbols for macOS versions are: `:mavericks`, `:yosemite`, `:el_capitan`, `:sierra`, `:high_sierra`, and `:mojave`. The corresponding numeric version strings should be given as major releases containing a single dot.
+The available symbols for macOS versions are: `:mavericks`, `:yosemite`, `:el_capitan`, `:sierra`, `:high_sierra`, `:mojave`, and `:catalina`. The corresponding numeric version strings should be given as major releases containing a single dot.
+
+Note that in the official Homebrew Cask repositories only the symbolic names are allowed. The numeric comparison may only be used for third-party taps.
+
 
 ### Always Fall Through to the Newest Case