diff --git a/src/libs/utils/environmentdialog.cpp b/src/libs/utils/environmentdialog.cpp
index 123a571646b..7a8b8f588fa 100644
--- a/src/libs/utils/environmentdialog.cpp
+++ b/src/libs/utils/environmentdialog.cpp
@@ -46,6 +46,8 @@ Utils::optional<EnvironmentItems> EnvironmentDialog::getEnvironmentItems(
         tr("Edit Environment"),
         tr("Enter one environment variable per line.\n"
            "To set or change a variable, use VARIABLE=VALUE.\n"
+           "To append to a variable, use VARIABLE+=VALUE.\n"
+           "To prepend to a variable, use VARIABLE=+VALUE.\n"
            "Existing variables can be referenced in a VALUE with ${OTHER}.\n"
            "To clear a variable, put its name on a line with nothing else on it.\n"
            "To disable a variable, prefix the line with \"#\"."));