diff --git a/lib/smol_str/README.md b/lib/smol_str/README.md
index 0cc1910181..610726a216 100644
--- a/lib/smol_str/README.md
+++ b/lib/smol_str/README.md
@@ -7,7 +7,7 @@
 
 A `SmolStr` is a string type that has the following properties:
 
-* `size_of::<SmolStr>() == size_of::<String>()`
+* `size_of::<SmolStr>() == 24 (therefor == size_of::<String>() on 64 bit platforms)
 * `Clone` is `O(1)`
 * Strings are stack-allocated if they are:
     * Up to 23 bytes long
diff --git a/lib/smol_str/src/lib.rs b/lib/smol_str/src/lib.rs
index a67a7fc096..91dc6252cc 100644
--- a/lib/smol_str/src/lib.rs
+++ b/lib/smol_str/src/lib.rs
@@ -19,7 +19,7 @@ use core::{
 
 /// A `SmolStr` is a string type that has the following properties:
 ///
-/// * `size_of::<SmolStr>() == size_of::<String>()`
+/// * `size_of::<SmolStr>() == 24 (therefor == size_of::<String>() on 64 bit platforms)
 /// * `Clone` is `O(1)`
 /// * Strings are stack-allocated if they are:
 ///     * Up to 23 bytes long