diff --git a/docs/known.limitations.md b/docs/known.limitations.md
new file mode 100644
index 0000000..2977642
--- /dev/null
+++ b/docs/known.limitations.md
@@ -0,0 +1,20 @@
+# Known Limitations
+
+## old curl version
+
+Curl would complain about each option and it would not upload.
+The error would read something like:
+
+- `curl: option --no-progress-meter: is unknown`
+- `curl: option --compressed: is unknown`
+- `curl: option --w: is unknown`
+
+Usually it means your operating system distribution has quite old curl version,
+and thus certain options are not available - for example you run Raspbian 10 Buster
+on older Raspberry Pi (see `cat /etc/os-release`)
+
+Fix:
+you can comment out (or remove) in `prusa-connect-camera.sh` script lines
+containing those options by just removing them, until it works.
+
+But frankly speaking you REALLY should think about upgrading your operating system.
diff --git a/mkdocs.yml b/mkdocs.yml
index a54fa58..94d9df9 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -47,6 +47,7 @@ nav:
 
   - Preparation:
     - Requirements: requirements.md
+    - Known Limitations: known.limitations.md
     - Installation: installation.md
   - Configuration:
     - Overview: configuration.overview.md