From 67d93d05586ffc8d2180c134a913434ca55e79d7 Mon Sep 17 00:00:00 2001
From: Tyge Løvset <60263450+tylov@users.noreply.github.com>
Date: Sun, 16 Aug 2020 14:40:42 +0200
Subject: Update README.md

---
 README.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/README.md b/README.md
index 8a471b18..8118684f 100644
--- a/README.md
+++ b/README.md
@@ -138,6 +138,12 @@ cmap_si_destroy(&map);
 An alternative is to use *char* * as key type, but then you must manage allcoated memory of the hash char* keys yourself.
 Note that this customization is also available for **cvec**, but only affects the *find()* function currently. See *declare_cvec_str()*.
 
+Finally, cmap mimics c++17 unordered_map::try_emplace() and avoids cstr memory leak if key already exists in this example:
+`
+declare_cmap_str(ss, cstr_t, cstr_destroy); // cstr_t -> cstr_t
+...
+cmap_try_emplace(&map, ss, "already here", cstr_make("won't be called then")); // special: tag 'ss' is a parameter here.
+`
 You may want to look at **examples/advanced.c**, it demonstrates how to use a custom struct as a hash map key, using the optional parameters to declare_cmap().
 
 Example usages
-- 
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