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-rw-r--r--src/libexpr/primops.cc6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index c28e7cbc7..544785adc 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -3957,7 +3957,11 @@ static RegisterPrimOp primop_replaceStrings({
.args = {"from", "to", "s"},
.doc = R"(
Given string *s*, replace every occurrence of the strings in *from*
- with the corresponding string in *to*. For example,
+ with the corresponding string in *to*.
+
+ The argument *to* is lazy, that is, it is only evaluated when its corresponding pattern in *from* is matched in the string *s*
+
+ Example:
```nix
builtins.replaceStrings ["oo" "a"] ["a" "i"] "foobar"