diff --git a/README.md b/README.md
index 5bbad6d..c48bf15 100644
--- a/README.md
+++ b/README.md
@@ -170,6 +170,8 @@ Or simply build it and link to the current directory:
 nix build github:librekeys/picoforge
 ```
 
+**Tip:** You can use our binary cache to save build time by allowing Nix to set extra-substitutes.
+
 #### b. without Flakes
 
 Download the package definition:
diff --git a/docs/Building.md b/docs/Building.md
index 8e96a6b..8638304 100644
--- a/docs/Building.md
+++ b/docs/Building.md
@@ -94,6 +94,8 @@ Or simply build it and link to the current directory:
 nix build github:librekeys/picoforge
 ```
 
+**Tip:** You can use our binary cache to save build time by allowing Nix to set extra-substitutes.
+
 #### b. without Flakes
 
 Download the package definition: