diff --git a/users/wpcarro/website/blog/posts.nix b/users/wpcarro/website/blog/posts.nix
index b791f0365..1dd6930a1 100644
--- a/users/wpcarro/website/blog/posts.nix
+++ b/users/wpcarro/website/blog/posts.nix
@@ -43,4 +43,11 @@
     content = ./posts/restic.md;
     draft = false;
   }
+  {
+    key = "tee-time";
+    title = "tee time";
+    date = 1657597870;
+    content = ./posts/tee-time.md;
+    draft = false;
+  }
 ]
diff --git a/users/wpcarro/website/blog/posts/tee-time.md b/users/wpcarro/website/blog/posts/tee-time.md
new file mode 100644
index 000000000..c8107fcde
--- /dev/null
+++ b/users/wpcarro/website/blog/posts/tee-time.md
@@ -0,0 +1,16 @@
+I encountered this fun TIL while troubleshooting Linux write permissions
+issues...
+
+## TL;DR
+
+Don't do this (unless you want misleading test results):
+
+```shell
+λ sudo -u node-exporter echo 'Hello, world' >/var/lib/textfile-exporter/test.prom
+```
+
+Do this:
+
+```shell
+λ echo 'Hello, world' | sudo -u node-exporter tee /var/lib/textfile-exporter/test.prom
+```