diff --git a/master_changes.md b/master_changes.md
index cf42fc99e91..9b00ed55345 100644
--- a/master_changes.md
+++ b/master_changes.md
@@ -69,6 +69,7 @@ users)
 
 ## Repository
   * When several checksums are specified, instead of adding in the cache only the archive by first checksum, name by best one and link others to this archive [#4696 rjbou]
+  * Update opam repository man doc regarding removal of the last repository in a switch [#4435 - fixes #4381]
 
 ## Lock
   *
diff --git a/src/client/opamCommands.ml b/src/client/opamCommands.ml
index 4e71354a8f2..f2acf8f309d 100644
--- a/src/client/opamCommands.ml
+++ b/src/client/opamCommands.ml
@@ -2027,9 +2027,10 @@ let repository cli =
      enable a repository only to install its switches, you may be \
      looking for $(b,opam switch create --repositories=REPOS).";
     cli_original, "remove", `remove, ["NAME..."],
-    "Unselects the given repositories so that they will not be used to get \
-     package definitions anymore. With $(b,--all), makes opam forget about \
-     these repositories completely.";
+    "Removes the given repositories from the selected scopes (the default scope is the current switch, \
+     see $(b,--this-switch)). Repositories are removed completely with $(b,--all-switches). \
+     If the last repository is removed in the current switch scope, then the selection of \
+     repositories is restored to the default selection ($(b,opam list --set-default)).";
     cli_original, "set-repos", `set_repos, ["NAME..."],
     "Explicitly selects the list of repositories to look up package \
      definitions from, in the specified priority order (overriding previous \