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-rw-r--r--src/doc/rustc/src/codegen-options/index.md3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/doc/rustc/src/codegen-options/index.md b/src/doc/rustc/src/codegen-options/index.md
index 1883346430b..4eb2aa99175 100644
--- a/src/doc/rustc/src/codegen-options/index.md
+++ b/src/doc/rustc/src/codegen-options/index.md
@@ -161,6 +161,9 @@ to save information after compiling a crate to be reused when recompiling the
 crate, improving re-compile times. This takes a path to a directory where
 incremental files will be stored.
 
+Note that this option currently does not take effect unless
+`RUSTC_FORCE_INCREMENTAL=1` in the environment.
+
 ## inline-threshold
 
 This option lets you set the default threshold for inlining a function. It