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-rw-r--r--src/libcmd/installables.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libcmd/installables.cc b/src/libcmd/installables.cc
index 21db2b08b..3cf25e2bc 100644
--- a/src/libcmd/installables.cc
+++ b/src/libcmd/installables.cc
@@ -146,7 +146,8 @@ SourceExprCommand::SourceExprCommand(bool supportReadOnlyMode)
.shortName = 'f',
.description =
"Interpret installables as attribute paths relative to the Nix expression stored in *file*. "
- "If *file* is the character -, then a Nix expression will be read from standard input.",
+ "If *file* is the character -, then a Nix expression will be read from standard input. "
+ "Implies `--impure`.",
.category = installablesCategory,
.labels = {"file"},
.handler = {&file},