diff --git a/runtime/doc/fold.txt b/runtime/doc/fold.txt
index b819a67067..ae72bf36d8 100644
--- a/runtime/doc/fold.txt
+++ b/runtime/doc/fold.txt
@@ -632,14 +632,17 @@ what you type!
 When using an operator, a closed fold is included as a whole.  Thus "dl"
 deletes the whole closed fold under the cursor.
 
-For Ex commands that work on buffer lines the range is adjusted to always
+For Ex commands that operate on buffer lines, the range is adjusted to always
 start at the first line of a closed fold and end at the last line of a closed
-fold.  Thus this command: >
+fold.  Thus, this command: >
 	:s/foo/bar/g
 when used with the cursor on a closed fold, will replace "foo" with "bar" in
 all lines of the fold.
 This does not happen for |:folddoopen| and |:folddoclosed|.
 
+Note that for some Ex commands like |:source| the range is only adjusted when
+using a two-address [range].
+
 When editing a buffer that has been edited before, the last used folding
 settings are used again.  For manual folding the defined folds are restored.
 For all folding methods the manually opened and closed folds are restored.
diff --git a/runtime/doc/repeat.txt b/runtime/doc/repeat.txt
index b4f9bbb567..cdb07e3a0e 100644
--- a/runtime/doc/repeat.txt
+++ b/runtime/doc/repeat.txt
@@ -207,6 +207,11 @@ For writing a Vim script, see chapter 41 of the user manual |usr_41.txt|.
 			sourced more than once, then the functions in the
 			buffer are defined again.
 
+			Implementation detail: When sourcing a [range] of
+			lines that falls inside a folded region, the range
+			will be adjusted to the start and end of the fold,
+			but only if a two-address range was used.
+
 							*:source!*
 :so[urce]! {file}
 			Runs |Normal-mode| commands from {file}. When used