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diff --git a/doc/ale.txt b/doc/ale.txt
index fa5e30de..636ef12a 100644
--- a/doc/ale.txt
+++ b/doc/ale.txt
@@ -1363,6 +1363,21 @@ g:ale_set_balloons *g:ale_set_balloons*
globally.
+g:ale_set_balloons_legacy_echo *g:ale_set_balloons_legacy_echo*
+ *b:ale_set_balloons_legacy_echo*
+ Type: |Number|
+ Default: undefined
+
+ If set to `1`, moving your mouse over documents in Vim will make ALE ask
+ `tsserver` or `LSP` servers for information about the symbol where the mouse
+ cursor is, and print that information into Vim's echo line. This is an
+ option for supporting older versions of Vim which do not properly support
+ balloons in an asynchronous manner.
+
+ If your version of Vim supports the |balloon_show| function, then this
+ option does nothing meaningful.
+
+
g:ale_set_highlights *g:ale_set_highlights*
Type: |Number|