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-rw-r--r--src/doc/rustc/src/codegen-options/index.md2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/doc/rustc/src/codegen-options/index.md b/src/doc/rustc/src/codegen-options/index.md
index 94f21042c8f..a616409d9a4 100644
--- a/src/doc/rustc/src/codegen-options/index.md
+++ b/src/doc/rustc/src/codegen-options/index.md
@@ -187,7 +187,7 @@ This flag lets you control debug information:
 
 This flag lets you control the optimization level.
 
-* `0`: no optimizations
+* `0`: no optimizations, also turn on `cfg(debug_assertions)`.
 * `1`: basic optimizations
 * `2`: some optimizations
 * `3`: all optimizations